Error Codes

  • Below are lists of REST API error codes, and an explanation of how errors are returned back to applications.

Handling and Logging Exceptions

When developing for Marketo, it’s very important that requests and responses get logged when an unexpected exception is encountered.  While certain types of exceptions, such as expired authentication can be safely handled by reauthentication, others may require support interactions, and requests and responses will always be requested in this scenario.

Error Types

The Marketo REST API can return three different types of errors under normal operation:

  • HTTP-Level – These errors are indicated by a 4xx code.
  • Response-Level – These errors are included in the “errors” array of the JSON response.
  • Record-Level – These errors are included in the “result” array of the JSON response, and are indicated on an individual record basis with the “status” field and “reasons” array.

For Response-Level and Record-Level error types, an HTTP status code of 200 is returned.  For all error types, the HTTP reason phrase should not be evaluated as it is optional and subject to change.


Under normal operating circumstances Marketo should only return two HTTP status code errors, 413 Request Entity Too Large, and 414 Request URI Too Long.  These are both recoverable through catching the error, modifying the request and retrying, but with smart coding practices, you should never encounter these in the wild.

Marketo will return 413 if the Request Payload exceeds 1MB, or 10MB in the case of Import Lead.  In most scenarios it unlikely to hit these limits, but adding a check to the size of the request and moving any records which cause the limit to be exceeded to a new request should prevent any circumstances which lead to this error being returned by any endpoints.

414 will be returned when the URI of a GET request exceeds 8KB.  To avoid it, check against the length of your query string to see if it exceeds this limit.  If it does change your request to a POST method, then input your query string as the request body with the additional parameter ‘_method=GET’.  This forgoes the limitation on URIs.  It’s rare to hit this limit in most cases, but is somewhat common when retrieving large batches of records with long individual filter values such as a GUID.

The Identity endpoint can return a 401 Unauthorized error. This is typically due to an invalid Client Id or invalid Client Secret.

HTTP-Level Error Codes

Response Code



413 Request Entity Too Large Payload exceeded 1MB limit.
414 Request-URI Too Long URI of the request exceeded 8k. The request should be retried as a POST with param _method=GET in the URL, and the rest of the querystring in the body of the request.




Response level errors are present when the “success” parameter of the response is set to false, and will be structured like this:

Each object in the “errors” array has two members, “code,” which is a quoted integer from 601 to 799 and a “message” giving the plaintext reason for the error.  6xx codes always indicate that a request failed completely and were not executed.  An example of this is a 601, “Access token invalid,” which is recoverable by re-authenticating and passing the new access token with the request.  7xx errors indicate that the request failed, either because no data was returned, or the request was incorrectly parameterized, such as including an invalid date, or missing a required parameter.

Response-Level Error Codes

* An API call that returns this response code is not counted against your daily quota, or your rate limit


Response Code



502 Bad Gateway The remote server returned an error. Likely a timeout. The request should be retried with exponential backoff.
601* Access token invalid An Access Token parameter was included in the request, but the value was not a valid access token.
602* Access token expired The Access Token included in the call is no longer valid due to expiration.
603 Access denied Authentication is successful but user doesn’t have sufficient permission to call this API. Additional permissions may need to be assigned to the user role, or Allowlist for IP-Based API Access may be enabled.
604* Request timed out The request was running for too long (e.g. encountered database contention), or exceeded the time-out period specified in the header of the call.
The request should be retried with exponential backoff.
605* HTTP Method not supported GET is not supported for Sync Leads endpoint, POST must be used.
606 Max rate limit ‘%s’ exceeded with in ‘%s’ secs The number of calls in the past 20 seconds was greater than 100
607 Daily quota reached Number of calls today exceeded the subscription’s quota (resets daily at 12:00AM CST).

Your quota can be found in your Admin->Web Services menu.  You can increase your quota through your account manager.

608* API Temporarily Unavailable
609 Invalid JSON The body included in the request is not valid JSON.
610 Requested resource not found The URI in the call did not match a REST API resource type. This is often due to an incorrectly spelled or incorrectly formatted request URI
611* System error All unhandled exceptions
612 Invalid Content Type If you see this error, add a content type header specifying JSON format to your request. For example, try using “content type: application/json”. Please see this StackOverflow question for more details.
613 Invalid Multipart Request The multipart content of the POST was not formatted correctly
614 Invalid Subscription The destination subscription cannot be found or is unreachable.  This usually indicates temporary inaccessibility.
615 Concurrent access limit reached At most 10 requests can be processed by any subscription at a time. This will be returned if there are already 10 requests for the subscription ongoing.
616 Invalid subscription type The appropriate Marketo subscription type is required to access the Custom Object Metadata API.  Please consult your CSM for details.
701 %s cannot be blank The reported field must not be empty in the request
702 No data found for given search scenario No records matched the given search parameters.

Note: Many failed search operations will return “success = true” and no errors and set a warnings informational string.

703 Feature is not enabled for the subscription A beta feature that has not been in enabled in a user’s subscription
704 Invalid date format
  • A date was specified that was not in the correct format
  • An invalid dynamic content id was specified
709 Business Rule Violation The call cannot be fulfilled because it violates a requirement to create or update an asset, e.g. trying to create an email without a template. It is also possible to get this error when trying to:

  • Retrieve content for landing pages that contain social content.
  • Clone a program that contains certain asset types (see Program Clone for more information).
  • Approve an asset that has no draft (i.e. has already been approved).
710 Parent Folder Not Found The specified parent folder could not be found
711 Incompatible Folder Type The specified folder was not of the correct type to fulfill the request
712 Merge to person Account operation is invalid A Merge Leads call failed because of an attempt to merge leads that are Salesforce Person Accounts.   Salesforce Person Accounts must be merged in Salesforce.
713 Transient Error A system resource was temporarily unavailable at the time of the API call.  When this error is encountered, it is advised to wait for a period of time and then retry the request.
714 Unable to find default record type A Merge Leads call failed because it was unable to find a default record type.
718 ExternalSalesPersonID not found A Sync Opportunities call was made with a non-existant ExternalSalesPersonID  value.
719 Lock wait timeout exception A Clone Program call was made and timed out waiting for a lock.



Record level errors indicate that an operation could not be completed for an individual record, but the request itself was valid.  A response with record-level errors will follow this pattern:

Records included in the result array of calls will be ordered in the same way as the input array of a request.

Each record in a successful request may succeed or fail on an individual basis which is indicated by the status field of each record included in the result array of a response.  The “status” field of these records will be “skipped” and a “reasons” array will be present.  Each reason contains a “code” member, and a “message” member.  The code will always be 1xxx, and the message will indicate why the record was skipped.  An example would be where a Sync Leads request has “action” set to “createOnly” but a lead already exists for one of the keys in the submitted records.  This case will return a code of 1005, and a message of “Lead already exists” as displayed above.

Record-Level Error Codes

Response Code Description Comment
1001 Invalid value ‘%s’. Required of type ‘%s’ Error is generated whenever parameter value has type mismatch. For example string value specified for integer parameter.
1002 Missing value for required parameter ‘%s’ Error is generated when required parameter is missing from the request
1003 Invalid data When the data submitted is not a valid type for the given endpoint or mode; such as when id is submitted for a lead with action designated as createOnly or when using Request Campaign on a batch campaign.
1004 Lead not found For syncLead, when action is “updateOnly” and if lead is not found
1005 Lead already exists For syncLead, when action is “createOnly” and if lead already exists
1006 Field ‘%s’ not found An included field in the call is not a valid field.
1007 Multiple leads match the lookup criteria Multiple leads match the lookup criteria. Updates can only be performed when the key matches a single record
1008 Access denied to partition ‘%s’ The user for the custom service does not have access to a workspace with the partition where the record exists.
1009 Partition name must be specified
1010 Partition update not allowed The specified record already exists in a separate lead partition.
1011 Field ‘%s’ not supported When lookup field or filterType specified with unsupported standard fields (ex: firstName, lastName ..etc)
1012 Invalid cookie value ‘%s’ Can  occur when calling the Associate Lead with an invalid value for cookie parameter.

Can also occur when calling Get Leads by Filter Type with filterType=cookies and invalid valid value for filterValues parameter.

1013 Object not found Get object (list, campaign ..etc) by id will return this error code
1014 Failed to create Object Failed to create Object (list, ..etc)
1015 Lead not in list The designated lead is not a member of the target list
1016 Too many imports There are too many imports queued. A maximum of 10 is allowed
1017 Object already exists Creation failed because the record already exists
1018 CRM Enabled The action could not be carried out, because the instance has a native CRM integration enabled.
1019 Import in progress The target list is already being imported to
1020 To many clone to program The subscription has reached the alotted uses of cloneToProgramName in Schedule Program for the day
1021 Company update not allowed Company update not allowed during syncLead
1022 Object in use Delete is not allowed when an object is in use by another object
1025 Program status not found A status was specified to Change Lead Program Status that did not match a status available for the program’s channel.
1026 Custom object not enabled The action could not be carried out, because the instance does not have custom objects integration enabled.
1027 Max Activity Type Limit Reached The subscription has reached the maximum number of available custom activity types.
1028 Max field limit reached Custom activities have a maximum of 20 secondary attributes.
  • Too many jobs in queue
  • Export daily quota exceeded
  • Subscriptions are allowed a maximum of 10 bulk extract jobs in the queue at any given time.
  • By default extract jobs are limited to 500MB per day (resets daily at 12:00AM CST).
1035 Unsupported filter type In some subscriptions, the following Bulk Lead Extract filter types are not supported:  updatedAt, smartListId, smartListName.
1036 Duplicate object found in input A call was made to update two or more records using the same foreign key.  e.g. a Sync Companies call using the same externalCompanyId for more than one company.
1037 Lead was skipped The Lead was skipped because it is already in or past this status.
1042 Invalid runAt date The runAt date specified for Schedule Campaign was too far into the future (maximum is 2 years).
1048 Custom Object Discard Draft Failed A call was made to discard the draft version of a custom object.
1049 Failed to Create Activity Attributes array too long

The array of attributes passed to the record exceeded the max length of 65536 bytes

1076 Merge Leads call with mergeInCRM flag is true. You are creating a duplicate record. We recommend you use an existing record instead.

This is the error msg which Marketo receives when merging in Salesforce.

1077 Merge Leads call failed due to <SFDC Field> length A Merge Leads call with mergeInCRM set to true failed due to <SFDC Field> exceeding limit of allowed characters. To correct, reduce length of <SFDC Field>, or set mergeInCRM to false.
1078 Merge Leads call failed due to deleted entity, not a lead/contact, or field filter criteria doesn’t match. Merge failure, unable to perform merge operation in natively-synced CRM

This is the error msg which Marketo receives when merging in Salesforce.