Unable to resolve target 'android-15' until the SDK is loaded

Question

i'm quite new in eclipse.

I download a coding a get the error as below:

• the project was not build since its build path is incomplete. Cannot find the class for java.lang.Object. Fix the build path then try building this project
  -The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
• Unable to resolve target 'android-15'
• Unable to resolve target 'android-15' until the SDK is loaded.

Any idea how to solved it?

Answer 1

One thing which solved it for me was closing, then re-opening the project (r-click on project name in Package Explorer, "Close Project" then r-click on project name in Package Explorer, "Open Project").

No amount of cleaning the project helped me, and I had the correct version of the API installed. Eclipse is just super buggy and often breaks my build paths.