Example causes of this error are:
■ A PUT or GET statement specified a sequential file.
■ A FIELD statement specified a file not opened for
random access.
■ A PRINT # statement specified a sequential file opened
for input.
■ An INPUT # statement specified a file opened for output
or appending.
■ BASIC tried to use an include file previously saved in
compressed format. Include files must be saved in text
format. Reload the include file, save it in text
format, then try to run the program again.
■ An ISAM statement or function file-number argument
refers to an open file that is not an ISAM table.
ERR code: 54