What is this error anyone please help me

Hello,

Do the errors persist? When and how are errors generated? Have you tried restarting the browser or even the device?

NOT but i am unable to to add blocks in my project.

Not, what? the error doesn't persist and you have other problem with adding block? you have not tried to restart browser/device?

yes i did restarted my browser

i have problem with adding block also

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