Exception: The Execute method of job definition (ID ad81e6cd-51ef-4baa-aedc-d529219368b5) threw an exception

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When investigating the errors in the event log today I stumbled upon a strange error:

event ID 6398

The Execute method of job definition Microsoft.Office.Server.Search.Administration.QueryClassificationDictionaryUpdateTimerJobDefinition (ID ad81e6cd-51ef-4baa-aedc-d529219368b5) threw an exception. More information is included below.

Expected 1 Managed Metadata Proxy which is default keyword taxonomy for SSA 96233017-f26a-49b7-9950-1b8577beb4f8, but located 2

I new I had configured 2 Managed Metadata Service applications but what is the error about. After thinking about the problem for a hour it hit me that you need to specify a default Metadata service application.

Managed Service Connection

This can be done by selecting the proxy of the Managed Metadata service application and selecting the “Properties” button in the ribbon. The mistake that I made was that I selected “This service application is the default storage location for Keywords” and “This service application is the default storage for column specific term sets” for both of the service applications and neglected the warning message that SharePoint shows you.

Managed Service Connection Errors

This resolved in the error messages that were in the event log. By deselecting the options for one of the service applications the error messages were gone.