apparently the last version of OptiFine compatible with Fairy Lights for Minecraft 1.7.10 is OptiFine_1.7.10_HD_U_D6
So I posted this into the above mentioned thread google initially pointed me towards and even though the rule specifically says "unless you are providing interesting new information" witch I did it got deleted and I got a warning about necroposting from some guy named webrosc.
How idiotic is this ?
And it happens all the time to thousands nay millions of people.. they land on that page or similar ones and will not find the answer because of a braindead routine.
So either delete the thread without solution or let people write a solution to it!
Post the crash report. Crash reports are found in the crash-reports folder under the .minecraft folder or the folder where the Instance is stored.
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