error using textscan with csv files

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C.G.
C.G. el 16 de Feb. de 2022
Respondida: Walter Roberson el 16 de Feb. de 2022
I have been given a code to process some data in a csv file. When I run this I get the error below. Can anybody help?
fid = fopen('time.csv');
out = textscan(fid,'%s %f %f %s','delimiter',',','headerlines',1);
fclose(fid);
Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.

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Walter Roberson
Walter Roberson el 16 de Feb. de 2022
The fopen failed. The file does not exist in the matlab path, or you do not have permission. if you used the two-output form of fopen you would get a message about why it failed.

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