Issue on running this program #88

Hi, I'm new in flutter and would doing for some demo on nfc however once I download for the code for running but it's show some error as below and I have no idea how to fix it... Please providing some clue and thank you...

after finished for this configuration and run the program it's showing error as below

and I looking through stack overflow found the solution as this https://stackoverflow.com/questions/65516334/flutter-error-invalid-podfile-file-no-implicit-conversion-of-nil-into-string

however it also could not work as well