Error in custom tag deployment

[Priya dharshini]

  Error 500--Internal Server Error 
java.lang.NoClassDefFoundError: ATMTAG (wrong name: ATMTag)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:476)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:181)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:62)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:223)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:41)
at weblogic.servlet.jsp.StandardTagLib.parseTagDD(StandardTagLib.java:1327)
at weblogic.servlet.jsp.StandardTagLib.parseDD(StandardTagLib.java:1271)
at weblogic.servlet.jsp.StandardTagLib.(StandardTagLib.java:292)
at weblogic.servlet.jsp.TagLibHelper.loadTagLib(TagLibHelper.java:314)
at weblogic.servlet.jsp.JspLexer.loadTagLib(JspLexer.java:145)
at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE_BODY(JspLexer.java:5004)
at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE(JspLexer.java:4842)
at weblogic.servlet.jsp.JspLexer.mDIRECTIVE(JspLexer.java:4688)
at weblogic.servlet.jsp.JspLexer.mSTANDARD_THING(JspLexer.java:2093)
at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1879)
at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1752)
at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:962)
at weblogic.servlet.jsp.JspParser.doit(JspParser.java:105)
at weblogic.servlet.jsp.JspParser.parse(JspParser.java:228)
at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:120)
at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:258)
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:364)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:220)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:172)
at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:504)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:349)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:431)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6310)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
 
 
  

Please explain me how to solve this error.

[Stefan Evans]

I think its fairly straightforward if you look at the error:
java.lang.NoClassDefFoundError: ATMTAG (wrong name: ATMTag)

You have a class called ATMTag.
You are trying to load class ATMTAG.
upper/lower case letters matter.

Check your code.