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My Remix has started to throw out this error as of recently, I'm not really sure what it is as the code didn't trigger it previously only as of recently, and all other code is triggering it as well.
Failed to decode output: TypeError: Cannot read property 'length' of undefined
This is an issue with Remix.
The error that you're seeing is basically caused by a failed contract creation (most likely due to the gas being too low, so try increasing this first and foremost.) However, remix still seems to return the contract functionality as if the contract was successfully deployed, so basically you're dealing with a 'phantom' contract, it's not really deployed so the functionality doesn't work.
