error plug-in in games on facebook (Coral Isle) in my ca(u)se!

Up until last days i was able to play Coral Isle on my iMac desktop, now i can't because it's say ERROR PLUG-IN!

My version of iMac is: Capitan OS 10.11.6

I use most Safari, Mozilla and Opera (in all the browsers crushes)

I clean history from flash, from any browser that i used but without any success!

thanks!