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Hi. I make html5/iframe game. When I call Mtx.UseItemInstance function, I get an error: Uncaught DOMException: Blocked a frame with origin "https://game277212.konggames.com" from accessing a cross-origin frame. Help me, please.
IFrames come with increased security in order to prevent certain hacks. You have to explicitly give permissions to use a resource across different domain names. This is referred to as CORS. There's a very technical document on it [here](https://benohead.com/cross-document-communication-with-iframes/).
Otherwise in order to fix this, we need more information. Where did the error occur? Where were you running your code? Does your code try to access other things on the web?