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ACE tool DesignBuilder

I'm currently working on a CFD analysis using DesignBuilder. I've already done the CFD simulation fully converged and done the LMA tool calculations. The next step I wish to work with is the Air Change Effectiveness of the zone. I opened the ACE tool found in DesignBuilder's CFD module, it asked me to define de coordinates of the "breathable regions". I copied the values/coordinates that appeared within my model. Unfortunately the program gave me the following warning message "Invalid ACE region geometry Check that length, width and height are all positive and that the co-ordinates provided represent a block" . I've tried by arranging the values in different orders, I algo added the wall widths of the model to these values but it keeps giving me the same warning message. Has anyone been able to fix this issue? Thank you in advance.