value is greater than source account's balance
Transfer with value which is greater than source account's balance
Inability to pay some fees (e.g. account balance too low)
Transaction will be valid in the future, the tx nonce is greater than the expected nonce
Transaction is outdated, the tx nonce is smaller than the expected nonce
When using a signed extension that provides additional data for signing, it is required that the signing and the verifying side use the same additional data. Additional data will only be used to generate the signature, but will not be part of the transaction itself. As the verifying side does not know which additional data was used while signing it will only be able to assume a bad signature and cannot express a more meaningful error.
Could not find an unsigned validator for the unsigned transaction
The transaction would exhaust the resources of current block. The transaction might be valid, but there are not enough resources left in the current block or the current extrinsic exceeds the maximum weight a single extrinsic can have (2*10^12).
The transaction is temporarily banned. The outdated tx has been spam too much.
Transaction has too low priority to replace existing one in the pool.