You have tried to carry out a read or START operation on a file which has not been opened for INPUT or I-O, or which is not open at all.
Resolution:
Open the file for I-O or for INPUT and you should then be able to continue to run your program. However, as this error implies that your program logic contains a mistake, you might want to close any files which are open, execute a STOP RUN statement and then recode.
