Java EE (Java Enterprise Edition) General Discussion

Can anybody, tell me please what is the reason I am getting the error lib_external does not exist, when trying to build a simple struts web-application to create a war file.

The full error message is given below:
===========================================================
C:\Basic_Struts2_Ant>ant
Buildfile: C:\Basic_Struts2_Ant\build.xml

clean:
[delete] Deleting directory C:\Basic_Struts2_Ant\dist
[delete] Deleting directory C:\Basic_Struts2_Ant\build

init:
[mkdir] Created dir: C:\Basic_Struts2_Ant\build

compile:
[mkdir] Created dir: C:\Basic_Struts2_Ant\build\WEB-INF\classes
[javac] C:\Basic_Struts2_Ant\build.xml:69: warning: 'includeantruntime' was not set, defaulting
to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 2 source files to C:\Basic_Struts2_Ant\build\WEB-INF\classes

BUILD FAILED
C:\Basic_Struts2_Ant\build.xml:69: C:\Basic_Struts2_Ant\lib_external does not exist.

Total time: 2 seconds
C:\Basic_Struts2_Ant>
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can someone give me the clue faced the same problem earlier.

Thanks.
Sujoy