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Create scripts to install Aster Analytics functions to a custom schema.

Hello guys,
I am trying to find out a solution/an answer for my problem for some days and my conclusion (till now) is this one: it's possible to grant access for a schema to a role, but nor for its (schema's) content. Please correct me if I am wrong. 
Here is my problem:

Where there are several TPT Load jobs running at the same time, the TPT will randomly fail with the following error(s). But once we rerun the job again, the TPT just succeeds.
We try to let TPT figure out the file layout based on the target table's structure. It seems that the error happens before the Load operator even kicks off