Unable to create or add U# script

I can’t add any U# scripts on any world that i create. Selecting new program breaks Udon Behaviour. I’m oblivious to the couse of the problem since I just created empty world and followed most basic instructions. I can’t find anyone having same problems. Anyone knows what happens?

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What instructions are you looking at? In the screenshots I see a message that says error no script with a button to create a script.

What should I do if the rice cooker asks for rice and shows me a button labeled add rice?