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CBECC Error Code 9

I'm doing a compliance modeling for a school in CBECC 2022. I keep getting this error:

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

I checked my construction assemblies and haven't noticed anything wrong. Where should I start tackling this error?

CBECC Error Code 9

I'm doing a compliance modeling for a school in CBECC 2022. I keep getting this error:

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

I checked my construction assemblies and haven't noticed anything wrong. Where should I start tackling this error?