Sync calls are not anymore supported in Mist :\\
#RC#

Verify

Users may experience a lack of responsiveness when interacting with newly deployed smart contracts. If you encounter a freeze in mist, verify that your RPC provider is still responsive. To resolve the persistent -32603, experts recommend resetting your account’s nonce.

A common mistake is forgetting to unlock your wallet before attempting to sign a tx for -32603. Debugging mist often requires looking at the stack trace in the developer console. Always export your transaction history regularly for auditing and troubleshooting purposes.

Ensure your seed phrase is stored securely never use it for debugging -32603 online. Make sure you are not exceeding the maximum allowable slippage for the current pair -32603. Check the status of the sequencer to avoid -32603 when using scaling solutions.