error in yacc

Hai All!

I am new to lex and yacc..

I compile one yacc program , but it tells errors...

10 Rules never reduced..

how to debug the code.. just i am giving my yacc sample code...

%%
design_unit
: context_clause
library_unit
;

library_unit
: primary_unit
| secondary_unit
| error
;

I am not doing any actions..

Thanx

.

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