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Problem While trying to run Android applications using eclipse IDE,

the following build error occurs: Unable to build: the file dx.jar was not loaded from the SDK folder!

Solution Quick fix is to

Right click on project -> Properties -> Java Build Path (From Left List)

-> Libraries (Tab) -> Add Library (Button on right)

-> JRE System Library -> Next -> Workspace default JRE

-> Finish Permanent fix is to install latest Java SDK.