Error Using textscan Invalid fid

Hello,

i have following mistaker in the following part of my Matlab code. The Mistake ist unter de Code separate with dashes. Does someone please know how i can solve the problem?

26  formatSpec = '%*s%s%[^\n\r]';

28 fileID = fopen(filename,'r');
29 dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', 1,  'ReturnOnError', 0);
30 status = fclose(fileID);

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??? Error using ==> textscan
Invalid fid.

Error in ==> fetchQOI at 29
    dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'MultipleDelimsAsOne', 1,  'ReturnOnError', 0);

Error in ==> read_QOI at 6
    motor.fem.results.P_mech =  fetchQOI(motor.fem, 'Pmech'); % mean(Pmech(N_Steps/2+1:end));

Error in ==> slottedMachineFEM at 38
        motor = read_QOI(motor);

[Stephen23]

"Does someone please know how i can solve the problem?"

FOPEN a file that exists.

Most commonly the filename is incorrect or the file does not exist in the provided location. Use the 2nd output argument to get information on why FOPEN could not open any file:

[fileID,msg] = fopen(filename,'r');
assert(fileID>0,'%s',msg)

Did you provide the filename with an absolute/relative filepath?