ADAPTIVE_COPYING_COLLECTOR /AdaptiveCopying ADAPTIVE_COPYING_COLLECTOR /DWRITEBARRIER_SSB=1 CONCURRENT_MS_COLLECTOR /ConcurrentMSGC CONCURRENT_MS_COLLECTOR /DWRITEBARRIER_CMS=1 MARK_SWEEP_COLLECTOR /MarkSweepGC MARK_SWEEP_COLLECTOR NULL_COLLECTOR /NullGC NULL_COLLECTOR SEMISPACE_COLLECTOR /SemispaceGC SEMISPACE_COLLECTOR /DWRITEBARRIER_SSB=1 SLIDING_COLLECTOR /SlidingGC SLIDING_COLLECTOR /DWRITEBARRIER_SSB=1 The 'Collector' property has not been specified, or is not a recognized value. $(DefineConstants); $(DefineConstants)$(GCDefine)