Error PDB file cat not exist

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I am using cygwin under window to do statistical contact analysis for HADDOCK small molecule binding site tutorial. I am doing the setup under tcsh shell.

However when i try to run the command $WDIR/contacts-analysis.csh ‘cat file.nam’ for statistical contact analysis, it show the following error:

ERROR: PDB file cat does not exist
ERROR: PDB file (null) contains no resiude


Would appreciate if anyone can kindly explain to me what is the problem. Thank you.

I recheck and find out that i am using single quote instead of back quote. Suppose to be no problem now.