error in process model

What is the reason behind this error? Can anyone suggest on this please?I have mapped the correct rules only.

Thanks in advance.

Brainy

It seems like there is a custom output with a syntax error. Check the output tab of all nodes.

New Participant

It seems like in any of your output nodes a null value is returned or it cannot be mapped.

Inspiring

actually,i have passed all the variables correctly since I am getting data in the rule that I have created while mapping getting the error.

Known Participant

It seems like you mistakenly add output. can you click on that error and remove the outputs.

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