FCCS custom business rule is not working with No error but debug errors out with null exception

Summary:

e are calculating allocation in FCCS using custom business rule. Until yesterday it was running fine but suddenly it is getting executed in very short time without calculating anything. In Debug mode, it errors out with

Calc Manager Calc Script trasnform failed with Exception: Unable to load the following resource: An error occurred generating Rule validate post processing script. Exception Details: null.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

FCCS 24.01.30

Code Snippet (add any code snippets that support your topic, if applicable):

FIX("FCCS_No Movement", @Relative("ALLOCS_ITIN", 0), "FCCS_No Intercompany", "FCCS_Local GAAP", @Relative("Total Division", 0), @Relative("DEPTCT", 0), "FCCS_Periodic")