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