PalletOne currently has completed contract execution error message recording. PalletOne records transactions performed under normal contracts and classifies error content during contract execution. The contents are recorded in the format of error code and error message, so that the user can query the result conveniently when the contract is executed. The contract execution of PalletOne uses transaction as carrier to communicate between nodes. And eventually, the execution results are stored in the database, and the contract execution error messages are kept in the form of transactions.