Extraction at Arbitrary Points and NaN

I have gone through the matlab-comsol livelink manual, and I understand that the NaN output value occurs when the extraction point is outside of the computation domain; but in this case the point is within the domain and I am still getting the NaN value. Please, I will appreciate any assistance or suggestions.

Kindly find as attached the files in case you have sufficient time to run and check.

Regards

FEMI