I want to add, because you are the second person saying this.
IT Is NOT an Error, not even close. It is an informational, telling you that you passed in something that was Blank and therefor it couldn't do its job.
This is the oppositive of an error, although if you EXPECT there to be data, then you need to look at the flow, look at what it was supposed to do, look at the inputs and outputs of everything, if you are calling data from a list or database or flat file, make sure that it is actually there
The number of times someone thought it was "for absolutely positive surety" and were wrong... i'd be rich if I had a nickle each time
Spaces, people messing up the data, changing it bla bla...
Check why the data you thought you have, does not have the details you are calling an error on the action.