Error in merging 2 shape file

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I am trying to merge two shape files ...

Here are the links of two shape files

Australian State & Territory

State and Territory ASGC Ed 2011 Digital Boundaries in ESRI Shapefile Format (http://www.abs.gov.au/ausstats/subs...A2578CC0012083E&0&July 2011&14.07.2011&Latest)

Australian Suburbs

State Suburbs ASGS Non ABS Structures Ed 2011 Digital Boundaries in ESRI Shapefile Format(http://www.abs.gov.au/AUSSTATS/subs...578D40013268D&0&July 2011&22.07.2011&Previous)

When I try to merge with QGIS extension MMQGIS.

But it is giving me following error. I try to google it but cant find something that newbee can understand.

Error!! Merged layers must all be same type of geometry (polygon != polygon 2.5D)



Can someone explain what exactly this error is and how to fix the problem and merge two files ?



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