Duplicate symbol error in Xcode Build

duplicate symbol _OBJC_IVAR_$_MainPageScreenCollectionReusableView._mainPageScreenHeaderLabel in: /Users/bharathbalaraj/Library/Developer/Xcode/DerivedData/SentientiOS-anuolaqayswdbzakppukvtjatylz/Build/Intermediates/SentientiOS.build/Debug-iphonesimulator/SentientiOS.build/Objects-normal/x86_64/MainPageScreenCollectionReusableView-9480B7CE5B075E6A.o duplicate symbol _OBJC_METACLASS_$_MainPageScreenCollectionReusableView in: /Users/bharathbalaraj/Library/Developer/Xcode/DerivedData/SentientiOS-anuolaqayswdbzakppukvtjatylz/Build/Intermediates/SentientiOS.build/Debug-iphonesimulator/SentientiOS.build/Objects-normal/x86_64/MainPageScreenCollectionReusableView-9480B7CE5B075E6A.o duplicate symbol _OBJC_CLASS_$_MainPageScreenCollectionReusableView in: /Users/bharathbalaraj/Library/Developer/Xcode/DerivedData/SentientiOS-anuolaqayswdbzakppukvtjatylz/Build/Intermediates/SentientiOS.build/Debug-iphonesimulator/SentientiOS.build/Objects-normal/x86_64/MainPageScreenCollectionReusableView-9480B7CE5B075E6A.o ld: 3 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) .. i am getting this error when i compile in xcode . not sure how this is coming