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I know I am a few years late but this could be of use to someone. This issue can be resolved by File -> Open Subset and Under 'Directory', 'Browse' to the folder which was your destination when you had installed MetamorphoSys (say mmsys) mmsys\2015AB\META . This should take care of the issue. I haven't tried MySQL yet but it basically needs to know where you have installed the Thesaurus which in the error is the 'BrowsableInputStream'.
Why did someone downvote this answer? – Franck Dernoncourt – 2018-12-07T00:30:42.187