Ant Packaging Error Ant\build.xml:698:null returned:1

1, ant compile suddenly error: e:\android-sdk\tools\ant\build.xml:657: the following error occurred while executing this line:

                                                                                                                  Null returned:1

2, directly modify the configuration inside the SDK, personally feel that is not very good, then you can in the root directory of your project Build.xml file to add:  

<property name= "Aapt.ignore.assets"  value= "!. Svn:!. git:\x3cdir\x3e_*:.*:! Cvs:!thumbs.db:!picasa.ini:!*.scc:*~:crunch "&NBSP;/>              

3, the value of my original project is: "!. Svn:!. git:.*:&lt;dir&gt;_*:! Cvs:!thumbs.db:!picasa.ini:!*.scc:*~:&lt;dir&gt;crunch ";

Later changed to "&lt;dir&gt;crunch:!." Svn:!. git:.*:&lt;dir&gt;_*:! cvs:!thumbs.db:!picasa.ini:!*.scc:*~ "/> can be compiled normally.

Ant Packaging Error Ant\build.xml:698:null returned:1