Unexpected token in message field

[BaseMax]

i am unable to parse a .proto file

it throws an error ('Unexpected token in message field: ' + tokens[0])

can anybody say what does this error mean and how to fix?

[c-p-b]

Not all new syntaxes for proto3 are currently supported by this library.

That is a generic error for the parser meaning something went wrong as it lexed the file. It could be any number of different things causing the issue. If you provide a sample .proto file that throws the error it will be a lot easier to figure out what is going wrong.