This variable assignment does not work. The value of $LOG_FILE is always blank.
It is executed as two parts:
LOG_FILE=/var/xtmp/log/XMP_*
Which fills $LOGFILE with a long continuous line of filenames and produces no output.
tail -1
Which reads the blank output from the first command and blanks out $LOGFILE.

Because the script contains many syntax errors, we need to know what each stage of the script is meant to do.



Spelling police:
Please Check Immeiately
should be
Please Check Immediately