failed sandbox site creation within sis_upload.rb

[zqian]

There are two major components within sis_upload.rb:

• upload the SIS zip file to Canvas
• check for personal sandbox course site existence for all included users with "ta" or "teacher" role in the SIS zip file. The sandbox site name should follow the format of " 's Practice Course", and included inside subaccount of "Practice Course Sub-Account"

The second practice site creation failed to work.