LIOOB-3801-6 error code

When attempting to schedule a project in P6 Pro client, the following error occurs.

ERROR
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LIOOB-3801-6. List index out of bounds (1)

STEPS
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The issue can be reproduced at will with the following steps:
Start P6 Pro client, open a project.
Press F9 then press Schedule button.

BUSINESS IMPACT
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The issue has the following business impact:
Due to this issue, users cannot schedule projects.

Cause

There are loops with completed activities in the schedule. While scheduling with the options of Progress Override or Actual Dates, these completed activities are being picked up and causing the scheduling process to stop.

Progress override/Actual Dates options should ignore the loops with completed activities and proceed with scheduling