1. Check the signature algorithm and key: Make sure that the signature algorithm and key used are the same as those used by the sender. Mismatch will lead to wrong signature. Please make sure to use the same signature algorithm and key to ensure correct signature authentication.

2. Check the integrity of data transmission: the signature error is caused by data being tampered with during transmission. You can check the mode of data transmission to ensure the integrity of data during transmission. Using secure transmission protocol can provide a protection mechanism for data transmission and reduce the possibility of data tampering.

3. Check the data source: If there is a signature error when obtaining data from an external data source and verifying its signature, then the problem lies with the data source. Ensure that data is obtained from trusted sources and verify the reliability of data sources. Methods of verifying data sources include checking their authentication mechanism, reputation and history.