I am developing an Android application, I was doing just fine then I made some changes to the code. Everything went fine, no error messages, until I ran the code. Then I get this in a popup dialog. Your project contains error(s), please fix them before running your application The title of the popup dialog is "Android Launch". I know this isn't much to go on, but this is all I am getting. I get nothing in the console at the bottom of eclipse either.
The dialog message has no Details button. =/
This may mean that you have an error in one of the project's XML files. When an XML file is malformed (missing tags, incorrect values, etc.), Eclipse is able to sense that the project can't compile correctly, but it can't tell where the problem is. Have you added or changed any XML files since the last successful run, such as a layout resource or the manifest? If so, I'd suggest going back and checking your changes to make sure they're correct.
Look in the left tree of your project and look for the file with the red error icon. In that file on the line of the error there should be another red icon showing an error. If you high light over the icon it should tell you the actual error.