[Mono-osx] Merging Mono failed

[zybook]

when i package my helloworld mac demo, the monodevelop show this error,why?


Merging Mono into app bundle
/Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/mmp
-o "/tmp/monomac-build-634672533079142130" -n "mac_hello" -a
"/Library/Frameworks/Mono.framework/Versions/2.10.8/lib/mono/4.0/System.dll"
-a
"/Library/Frameworks/Mono.framework/Versions/2.10.8/lib/mono/4.0/System.Xml.dll"
-a
"/Library/Frameworks/Mono.framework/Versions/2.10.8/lib/mono/4.0/System.Core.dll"
-a
"/Library/Frameworks/Mono.framework/Versions/2.10.8/lib/mono/4.0/System.Xml.Linq.dll"
-a
"/Library/Frameworks/Mono.framework/Versions/2.10.8/lib/mono/4.0/System.Drawing.dll"
-a
"/Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/MonoMac.dll"
"/Users/zybook/Projects/mac_hello/mac_hello/bin/Release/mac_hello.exe"
Mono.framework CSDK is missing.  Please install the CSDK for your
Mono.framework version from http://mono-project.com/Downloads
mmp exited with code 252

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