NSException error core in Xcode

ive worked my way through the guides to integrate admobs into Xcode and when I finally test it on the simulator I get this error code and nothing happens:

Exception NSException * "The Google Mobile Ads SDK was initialized without AppMeasurement"

when I go to the terminal it says this is already installed. what should I do to fix this?

thank you!

NSException error core in Xcode
 
 
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