Problem: Repartition Disk utility

Hi all, I'm trying to repartition my macbook Intell processor through the disk utility, I've tried dragging the slider high and low but it wont work, I only get error partitioning
failed Partitioning failed.
Error: No space left on device

Please help me fast and sorry for my bad english

And i also didn't know where to put it so i put it below the Macbook section

 

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