Hey who still encountered this problem on 2021? Hope you don't xD
This error usually occurs when you're trying to run .JAR files which were downloaded from the internet, and usually occurs only on Linux-based operating system. Most of linux users know this already, but just made this tut for the newbies.
*Actually i was very panic at first time, like all newbies do lmao.

Still confused? Let me know on the comment section!

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