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Apache Toat/7.0.62 - Error report

HTTP Status 500 - String index out of range: -10

\r

    type Exception report\r

    ssage String index out of range: -10\r

    description The server encountered an internal error that prevented it frofulfilling this request.\r

    exception

    java.lang.StringIndexOutOfBoundsException: String index out of range: -10

    java.lang.String.substring(String.java:1911)

    colib.DecryptUtil.fileDecrypt(DecryptUtil.java:22)

    coencrypt.Action.execute(Action.java:59)

    sun.reflect.GeneratedMethodAessor38.invoke(Unknown Source)

    sun.reflect.DelegatingMethodAessorIl.invoke(DelegatingMethodAessorIl.java:43)

    java.lang.reflect.Method.invoke(Method.java:606)

    coopensyhony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)

    coopensyhony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)

    coopensyhony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)

    coopensyhony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)

    coopensyhony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

    coopensyhon