Custom Assembly produces an error in C3D 2012

Hi! I am wondering why I am having an error which pops out in my laptop using AutoCAD to Civil 3D 2012. I cannot carry out the tool because I don’t have an ample storage available to finish the operation as shown in the image:

AutoCAD to Civil 3D 2012
Unable to execute the tool. Not enough storage is available to complete this operation.
I would be very glad is someone will come up with some ideas to correct this.
