Hello, please see https://knowledge.safe.com/questions/40453/invalid-scale-reduction-specified-error-when-openi.html?
Solved
Possible bug in FME 2017 RC on OS/X
Best answer by fmelizard
PR 76123 has been filed. Another customer also experienced this problem and discovered a temporary solution:
1. Open /Library/FME/2017.0/Reproject/LocalCoordSysDefs.fme in any text editor
2. Find the definition for Calgary_3TM_WGS_1984_W114 (~Line 264)
3. Change the SCL_RED value from 0.999900 to 1
4. Save the file and try opening FME Desktop again
Rylan from Safe has added to the question
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