I am new to Marpa and I hope I can ask some newbie questions here.

I very often get the error "No lexeme found" and I would like to understand 
it.

The following grammar part works fine:

limited_identifier ~ [a-zA-Z_] identifier_extend
identifier_extend ~ [a-zA-Z0-9_]+


But this one throws the error:

limited_identifier ~ [a-zA-Z_] [a-zA-Z0-9_]+


For me there is no difference. But there seems to be a difference for Marpa.

What is the difference?

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