For me it was a combination of underscore and number, function name exchange1 is valid but exchange_1 is giving Fallback functions are not supported error
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hi, CAPITAL letters are not supported for function name in your rust on-chain program.
I get the same error when I use some.
For me it was a combination of underscore and number, function name
exchange1is valid butexchange_1is givingFallback functions are not supportederror