Error 999999 “The table already exists”“No spatial reference exists” when using “import arcserver”

I’m hoping someone can help me understand why I’m getting this error. I have a python script tool that throws this error when it is run through the task scheduler:

Traceback (most recent call last):
  File "C:Image_ProcessingPython_Scripts_Automation_CACreate_Report_Automation.py", line 474, in <module>
    arcpy.RasterCatalogToRasterDataset_management(pathRasterCatalog, scratchGDB + "/raster1", where_clause="Name = '" + sSingleImage + "'")
  File "c:program filesarcgisserverarcpyarcpymanagement.py", line 13319, in RasterCatalogToRasterDataset
    raise e
ExecuteError: ERROR 999999: Error executing function.
The table already exists.
No spatial reference exists.
Failed to execute (RasterCatalogToRasterDataset).

However, when I run it through arcmap, it runs fine. The only difference between the two instances is when I run it through the task scheduler, I use import arcserver, and when I run it through arcmap, I have to comment out that line. At first I thought it was something to do with the raster catalog, but then I started getting the exact same error when I added an arcpy.Clip_management() tool to the code, which doesn’t use the raster catalog. And I’ve checked the spatial references on all of the suspect data, and it does exist. So I’m at a loss. Is it something to do with the scratch GDB?