Darker bold font on node labels in the procces model designer and extrange message

Hi

 

I'm getting the message in the process model designer that says:

"Some referenced items could not be found. Please check the model and correct any problems"
Why this problem happens ussually? I can't fix it


Also I noticed there are some labels on nodes that are in bold font. What does it mean?

 

 

 


T
hanks in advance

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