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When making requests to Phantom in establishing a connection, sending a transaction, or signing a message, Phantom may respond with an error. The following is a list of all possible error codes and their meanings. These error messages are inspired by Ethereum’s EIP-1474 and EIP-1193.
CodeTitleDescription
4900DisconnectedPhantom could not connect to the network.
4100UnauthorizedThe requested method and/or account has not been authorized by the user.
4001User Rejected RequestThe user rejected the request through Phantom.
-32000Invalid InputMissing or invalid parameters.
-32002Requested resource not availableThis error occurs when a dapp attempts to submit a new transaction while Phantom’s approval dialog is already open for a previous transaction. Only one approve window can be open at a time. Users should approve or reject their transaction before initiating a new transaction.
-32003Transaction RejectedPhantom does not recognize a valid transaction.
-32601Method Not FoundPhantom does not recognize the method.
-32603Internal ErrorSomething went wrong within Phantom.
Typically, these errors will be easily parseable and have both a code and an explanation. For example: 
try {
  await window.solana.signMessage();
} catch (err) {
  //  {code: 4100, message: 'The requested method and/or account has not been authorized by the user.'}
}