Project Has No Project.properties File! Edit The Project Properties To Set One Error

I am getting the errors: Errors occurred during the build. Errors running builder 'Android Resource Manager' on project 'DashboardActivity'. java.lang.NullPointerException and [20

Solution 1:

Why don't you do this

Right click on Project Root folder > properties > Java BuildPath > Library Tab

Check whether any of library is missing (showing error with red cross) if yes then add this library to your project don't forget to CHECK it on Order and Export

Do one more thing

Right click on Project Root folder > properties > Android > set your Project Build Target

check any one target

Check your Android-sdk path from

Window > Preference > Android

Solution 2:

I was also having these errors:

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

and

The Project Properties Order and Export section has an error "Unable to get system library for this project"

I solved it by Right Clicking on the Project Root folder > properties > Android > set your Project Build Target and changed it to the highest target I could trust from working on other projects.

It has been 3 years since I had this project working. So I noticed when I was troubleshooting tonight, that the manifest did not have a targetSdkVersion, only a minSdkVersion of "8". So I had changed that to this:

After doing the above 2 things, all my errors were gone -- however (!) ... a bit later tonight, I was trying to export my project to an .apk. And Eclipse crashed. Upon re-opening it, Eclipse is super broken. I am about to do a re-boot my PC now - and thus need to finish posting this. I trust Eclipse will be back to normal. But the reason I am mentioning this is that I suspect I may need to re-install Eclipse as I have been getting other minor start-up errors when I open Eclipse. And the errors I had tonight in that app were very strange and unusual.