??? Name is nonexistent or not a directory

Error in ==> C:\MATLAB6p1\toolbox\spfirst_v111x\convertMfiles.m
On line 8  ==> cd(thisDir)

pwd
ans =
C:\MATLAB6p1\toolbox\spfirst_v111x\v110\cconvdemo\@cexponential
cd('C:\MATLAB6p1\toolbox\spfirst_v111x');
diary convertOPS.txt, convertmfiles('v110',pwd), diary off
