Error when to process many file

I have many file to process..when i run my program, after 100 file,appear error like below...

??? C:\Program Files\MATLAB\R2010a\toolbox\matlab\codetools\opentoline.m: Too many files open; check that FILES = 20 in your CONFIG.SYS file.

how to solve?

[F.]

do you really need to have 100 files opened in the same time ???

Answer 1

[Jan]

Most likely you forgot to close the files by fclose after the processing.