Error when trying to call a formula inside aother formula

Content

We have different validations needs for different absence types and a few validations are common across all absence types so i have decided to create a master validation fast formula from which i would like to call the formulas based on the absence type so that it will be more structured and organized to maintain and debug.

As a sample i created a master formula 'VU_ABS_ENTRY_VALIDATION_MASTER' and calling another formula 'VU_ABS_PERSONAL_LEAVE_ATTACH_VALIDATION' from it. Both formulas are in the attached document.

The master formula is associated to an absence type and tried to submit an absence. The following exception is received.