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These errors occur when gas pricing is misconfigured or when transaction simulation fails. They are most commonly encountered when using "auto" fee estimation.

Missing Gas Price

Thrown when using "auto" fee without setting a gas price:
Fix: pass gasPrice when creating the signing client:

Simulation Failure

simulate throws if the signer address is not found in the wallet:
If the simulation itself fails (e.g. message validation errors), the underlying gRPC error propagates.