Some suggestions...

First, if this is a program reading in a log created by another real program (not the output from SQL*Plus), change the program to not report the error.

Second, if this is SQL*PLUS, and this script will be run more than once or you want to run it in a batch mode on a production system, stop what your doing with the log reading script and start writing a program that will do the work instead. SQL*Plus does not have the error handling capabilities to handle problems in a production system. You are setting your self up for a life of misery if you are attempting to use an interactive tool in a batch mode. Its fine for testing or development, but if you don't want to waste your company's or customers' money on an expensive outage, don't use SQL*PLUS.