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CBECC 2022 Error Code 9

I am running a compliance modeling for a school. I keep getting this error that doesn't tell me where specifically the error is:

"Error: Undefined data: left side of '+' evaluating run u rule: Set DEFAULT ConsAssm:InsCheckSum (20:'ConstructAssembly.rule' line 3085)"

Where should I start to tackle this error?

CBECC 2022 Error Code 9

I am running a compliance modeling for a school. I keep getting this error that doesn't tell me where specifically the error is:

"Error: Undefined data: left side of '+' evaluating run u rule: Set DEFAULT ConsAssm:InsCheckSum (20:'ConstructAssembly.rule' line 3085)"

Where should I start to tackle this error?