I’ve found a solution to this error message in the Terra Station wallet (desktop app).
I followed the suggestion posted by @alagiz in another Agora thread “I cant send any token from Classic”. You can check his reply there.
These were my steps:
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Add Terra Station Wallet extension for Chrome and import your wallet.
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Open the web site pointed out by @alagiz (station dot terra dot money).
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Connect your wallet to this web site when prompted in the pop-up window.
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Send USTC/LUNC from this website wallet to your exchange.
It worked for me. Hopefully it will help somebody else too, until devs fix this someday…