Too many files
Either more files have been created in the root directory than the operating system permits, or more files have been opened than the number specified in the files= setting in your CONFIG.SYS file.
To correct this error
If your program is opening, closing, or saving files in the root directory, change your program so that it uses a subdirectory.
Increase the number of files specified in your files= setting in your CONFIG.SYS file, and restart your computer.