As suggested bopt, I had a look at my gems versions, I actually missed a
few. I updated to the last versions, following gems have been installed:
Installing websocket 1.2.1
Installing selenium-webdriver 2.44.0
Installing bootstrap-will_paginate 0.0.10
Installing sass 3.4.12
Installing annotate 2.6.5
Installing globalid 0.3.3

This solved the issue.

Thanks for your help!

Best regards,

Fred

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