In this post, you’ll learn about the COBOL runtime Error Code 020 and the reason why you are receiving it
COBOL Error Code :
020
Reason for this Error in COBOL
Device or resource busy (Recoverable) -You have tried to open a file that is assigned to a device or resource (for example, a line printer) that is not available at this time. -You can trap the error status returned by open and retry the open at regular intervals until it succeeds.