What does 'internal json-rpc error' typically indicate when using MetaMask Mobile?

An 'internal json-rpc error' in MetaMask Mobile generally signifies a problem communicating with the Ethereum network or the smart contracts you're interacting with. It can be caused by various factors like network connectivity issues, incorrect gas fees, contract errors, or problems with the MetaMask app itself. It's often a placeholder error and can be difficult to diagnose directly without deeper investigation.