NFC shield : Didn't find PN53x board problem !

I soldered the stacking headers and then I tried the example from the library that is described in your tutorial (Babel fish language toy) … but when I opened the serial monitor it showed that ( Didn’t find PN53x board) … WHAT COULD BE CAUSING THIS PROBLEM…

We were following the Babel fish tutorial that connects the wave shield to the nfc shield … so we tried to cut the trace between IRQ and the pin next to it … could this be causing the problem?
or it has not been cut yet?