Service template problem - Unable to perform the job because one or more of the selected objects are locked by another job - ID 2606

Hello,

I’ve finally managed to deploy my first guest cluster with a shared VHDX using a service template. 

So, I now want to try and update my service template.  However, whenever I try to do anything with it, in the services section, I receive the error:

Unable to perform the job because one or more of the selected objects are locked by another job.  To find out which job is locking the object, in the jobs view, group by status, and find the running or cancelling job for the object.  ID 2606

Well I tried that and there doesn’t seem to be a job locking the object.  Both the cluster nodes appear to be up and running, and I can’t see a problem with it at all.  I tried running the following query in SQL:

SELECT * FROM [VirtualManagerDB].[dbo].[tbl_VMM_Lock] where TaskID='Task_GUID'

but all this gives me is an error that says - conversion failed when converting from a character string to uniqueidentifier msg 8169, level 16, State 2, Line 1

I'm no SQL expert as you can probably tell, but I'd prefer not to deploy another service template in case this issue occurs again.

Can anyone help?