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Created attachment 10655 [details]
just three lines

Error message

Undefined variable: type in ...\extensions\SemanticWatchlist\SemanticWatchlist.hooks.php on line  164

Undefined variable: name in ...\extensions\SemanticWatchlist\SemanticWatchlist.hooks.php on line 170

Problem analysis

Defining a group neither specifying namespace, concept or category creates a problem in SemanticWatchlist.hooks.php because of a missing variable definition (switch in line 137 defines $type and $name only for namespace, concept or category).

Solution

An easy way out is that in those cases where no (namespace, concept or category) is found the switch falls back to a default and assumes that properties are watched in namespace main ->  wfMsg( 'main' ).