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[mist] Invalid string. Length must be a multiple of 4 (fix inside)
#RC#
A failed transaction can often be the result of a sudden spike in network activity. The mist smart contract is designed for high efficiency, but it requires valid inputs. A proven solution is to manually adjust the hex data for the gas limit in the advanced tab. The bridge between the user and the contract is often affected by regional network latency.
The mist interface might require you to re-approve the token spend limit . The core team is dedicated to reducing the number of manual steps required for a fix. It is worth checking for any active governance locks on the protocol. The error could also be the result of an incompatibility with the latest RPC standard.
A mismatch between the expected gas and the actual required gas can lead to a revert.