I have an issue where my loop isnt populating the sobject from the sobject_collection on the Flow Builder (none Java version)

I have tried to prove the issue by using an Assignment 



The Loop:


then trying to pass this Loop object along:


I get an email with all the correct info in the sobject_collection etc just this error on assignment:


 

Error element Populate_Line_Items (FlowAssignment).
The flow failed to access the value for VarOppo_Line_Item_Loop.acu_prid_id__c because it hasn't been set or assigned.

An ideas?

I have an issue where my loop isnt populating the sobject from the sobject_collection on the Flow Builder (none Java version)

I have tried to prove the issue by using an Assignment 



The Loop:


then trying to pass this Loop object along:


I get an email with all the correct info in the sobject_collection etc just this error on assignment:


 

Error element Populate_Line_Items (FlowAssignment).
The flow failed to access the value for VarOppo_Line_Item_Loop.acu_prid_id__c because it hasn't been set or assigned.

An ideas?