Getting GUID format error in uipath apps

I am trying to compare a relationship data type value with text data type value in uipath apps. my both values are coming from data service.
i am getting an error as “the provided value for given field [field_name] is not of GUID format.”

I found one function in uipath apps as guid(). but i dont know what is the use of that.

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Please share screenshot of your sequence. It will be easier to understand what your doing.
If you comparing values you can always change type of variable in the ‘variable panel’.

in this image, Department Name is of type relationship and PassDepartmentName is of type text in data services.

I am comparing both values to get data in data table.