Whats this error execution reverted 2

[EhigieO]

org.web3j.protocol.exceptions.TransactionException: Transaction 0xf727bfa1788388175befe9156e407dd6a5f71dfb9c6a59ec1102fe7dd3d93dfb has failed with status: 0x0. Gas used: 35947. Revert reason: 'execution reverted: 2'.

[wlswo]

Did you use token transfer??
The specific error cannot be known from the transaction hash value

[EhigieO]

I realized I needed to approve access to muy wallet first before the contract can execute. Thanks