Combine data from other worksheet to one worksheet Help Pls

Can someone enlightened me and help me I have a macro code here that supposed to consolidate all data from other worksheet to one worksheet. data will be from January to December worksheet and then combine to the combine worksheet. but the macro code seems not to be working, When I run the code nothing happens. Can someone help me on this. below is the code that I used. Any help would be greatly appreciated.

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