"Crunch" that occurs when Android builds a project using ant build in eclipse

-code-gen:[mergemanifest] found deleted target file[mergemanifest] merging  Androidmanifest files into one. [Mergemanifest] manifest merger disabled. using project manifest only.      [ECHO] HANDLING AIDL FILES...     [AIDL]  No AIDL files to compile.     [echo] ----------      [echo] handling renderscript files...     [ echo] ----------     [echo] Handling Resources...      [aapt] generating resource ids...     [aapt] invalid  resource directory name: f:\workspace\zlib\bin\res/crunch build failedd:\ Android\sdk\tools\ant\build.xml:601: the following error occurred while&nBsp;executing this line:d:\android\sdk\tools\ant\build.xml:653: the following error  occurred while executing this line:d:\android\sdk\tools\ant\build.xml:698: null  returned: 1

The following compilation error occurs, the workaround is as follows

Method 1: Assign a value in the system Tool/ant/build.xml file <property name= "aapt.ignore.assets" value= " Crunch"/>

Method 2: Add <property name= "Aapt.ignore.assets" value= "in your project build file!. Svn:!. git:\x3cdir\x3e_*:.*:! Cvs:!thumbs.db:!picasa.ini:!*.scc:*~:crunch "/>

"Crunch" that occurs when Android builds a project using ant build in eclipse