I have the exact same problem. I tried downgrading Jenkins from 1.642 -> 1.641 -> 1.640 -> 1.630 -> 1.620.
Opening Robot Framework report failed
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Looks like the log.html link is working again on 1.620. But I'am still unsure whether it was Jenkins 1.620 that did the trick or the Robot job execution. Btw. I am using Robot Framework plugin v.1.6.2.
I have the exact same problem. I tried downgrading Jenkins from 1.642 -> 1.641 -> 1.640 -> 1.630 -> 1.620.
Opening Robot Framework report failed
{{Verify that you have JavaScript enabled in your browser.
Make sure you are using a modern enough browser. Firefox 3.5, IE 8, or equivalent is required, newer browsers are recommended.
Check are there messages in your browser's JavaScript error log. Please report the problem if you suspect you have encountered a bug.}}
Looks like the log.html link is working again on 1.620. But I'am still unsure whether it was Jenkins 1.620 that did the trick or the Robot job execution. Btw. I am using Robot Framework plugin v.1.6.2.