A warning about detected issues with your attempted transaction can sometimes be seen at the transaction confirmation screen, similar to the example screenshot below.
This error means that there's something wrong with the logic of the transaction that would cause it to revert, and an additional indicator of such issues is the extraordinarily high transaction cost, as also visible in the screenshot above.
There are a few things that you can try to resolve this:
- Try refreshing your page and making the same action again
- Try disabling any script-blocking extensions that you have enabled in your browser
- Try using a different browser
- Try using a different amount