Error or Exception when installing license key

You may encounter the following error when attempting to enter a license key:

java.lang.NumberFormatException: For input string

This error indicates a problem with the format of the license.dat file and is usually caused by a missing line feed after a \ character. In the example below, the second and third lines of the license key have been merged.

FEATURE systems uptime 5.0 permanent uncounted HOSTID=00096ba550be \
NOTICE="UD00477 5738-01" SN=23 TS_OK SIGN="02DA 1623 64E5 62E2 \ 21FE DD79 B2A5 B93A 1554 E6C3 0601 0C9B FB82 BA08 837B D156 \
9D73 C6CA 1210 5ADD C9E8"

To resolve the problem, reformat the license (as shown below) by inserting a line break after each \ character.

FEATURE systems uptime 5.0 permanent uncounted HOSTID=00096ba550be \
NOTICE="UD00477 5738-01" SN=23 TS_OK SIGN="02DA 1623 64E5 62E2 \
21FE DD79 B2A5 B93A 1554 E6C3 0601 0C9B FB82 BA08 837B D156 \
9D73 C6CA 1210 5ADD C9E8"