The output shown in that example is not correct. We have a function that tests a validity of some session configuration files. Output contains the following line:
VERBOSE: The member 'AliasDefinitions' must contain the required key 'Description'. Add the require key to the file...
'Description' key cannot be the cause of a problem, because that key is optional, not required.
Check out the 'AliasDefinitions' description in the New-PSSessionConfigurationfile help topic:
Adds the specified aliases to sessions that use the session configuration. Enter a hash table with the following keys:
-- Description: A text string that describes the alias. This key is OPTIONAL.