ERROR 000464 - but no schema lock?

[ChristineSalvadore]

I've hit a wall trying to trouble shoot my script issue. I am trying to project data from a versioned geodatabase to a local geodatabase. My script has been working fine for months but all of the sudden i keep getting a schema lock error on the same dataset, the problem is, i can't find a lock in database Administration. So I'm performing the following code to investigate:

print(arcpy.TestSchemaLock(dataset))
arcpy.Project_management(dataset, "dataset_reprojected", PROJECTION)

 TestSchemaLock comes back as True, ie: should be open. But the Project function continues to come back with ERROR 000464 identifying a schema lock. 

python interpreter coming from Pro version 3.3.2

[DanPatterson]

what is 'dataset' ?

Solved: Schema lock error from script tool before script e... - Esri Community

but it may or may not be the issue given what is required for the TestSchemeLock and what you are providing to it.

[ChristineSalvadore]

dataset is a point featureclass

[DavidSolari]

Pop open the file geodatabase folder in explorer, find every .lock file and delete them. Any active locks will trigger the usual Windows error, from there you can use a tool like the File Locksmith in Windows PowerTools to figure out what's holding the lock and then stop that program to safely release it.