Good day Romy,
In my experience, this usually can occur when the K2 Service Account doesn't have proper permissions on the database the SQL Service Instance is built off of.
Would you please try granting the K2 Service Account DB Owner permissions and then refresh the service instance.
In addition to the information that was provided by
which discusses the "Excel Import Service Broker"
Please let me know if this is of help
Thank you and
Please see the deployment process as follows:-
Also, if using SmartObjects it is important that the Service Instance GUIDs is the same in all environments. If this is not the same you will have runtime errors because processes use the GUID of the service instance. See the following post on how you can synchronize the GUIDs:
Also ensure that SQL has valid permission for a given account...
First off, what version of K2 are you on? Have you tried refreshing the service instance where the SmartObject is created from? I will recommend that you enable SmartObject logging (https://help.k2.com/kb000298), execute the SmartObject again and when the error appears, check the log files as it may provide more information on the issue.