res\drawable-xhdpi\IMAGE.png: Invalid file name: must contain only [a-z0-9_.]

if you have this error in Android: res\drawable-xhdpi\IMAGE.png: Invalid file name: must contain only [a-z0-9_.]

- Restart Eclipse
- Validate the filename without: ,- capital letters !"#$%&/()=?'¡¿*+]}[{:.;,