The project was not built since its build path is incomplete

Question

Every time I try to import a project downloaded from googlecode into Eclipse but I get some errors:

The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project

Unable to resolve target 'android-10' (this changes from 1 to 15)

I've already checked the other answers on the site but no solution worked.

In

Properties -> Java Build Path -> Libraries

there's 1 item:

Unable to get system libraries for the project

Answer 1

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

This should solve at least one of your errors. Any others might require you to add further libraries.

Hope this helps.

Answer 2

Close eclipse and re-open worked for me. You may have to do this two or three times. Each time give it a minute for the auto build startup process (check bottom right hand corner) to complete, as these errors often disappear at this time.

Or try to clean the affected projects.

'Turn it off and on again'