LOG.Info error

So um, here's my problem.
Each time I try to add the [print[ block to a procedure, the following error pops out during building:

error: cannot find symbol
         LOG.info("This is an Onyx Ore. Your pickaxe has to be iron or better in order to collect it.")
         ^

I don't know if this is a bug or just an error, but I think it's a bug because this happens everytimes I want to add the [print[ block. So I'm waiting to know if it's really a bug before posting a ticket about this...