can any one tell reason abt this error

hi all,

 Iam using "eclipse-jee-europa3.3-win32" in windowsXP OS.

I written java code for String Reverse

package com.hbos.bpms;

import java.lang.String;
import java.lang.StringBuffer;

public class ReverseString {

    private static void doStringReverseChar(String input) {

        System.out.println("\nOriginal string: " + input);

        StringBuffer reverse = new StringBuffer(input).reverse();
        System.out.println("Reverse character string: " + reverse);

        System.out.println("\n");
    }

    /**
     * Sole entry point to the class and application.
     * @param args Array of String arguments.
     */
    public static void main(String[] args) {
     try {
     doStringReverseChar(args[0]);
     }catch(ArrayIndexOutOfBoundsException aie) {
     System.out.println(aie);
     }

    }

}

I got the following Output for input String "Katak"

Original string: Katak
Reverse character string: kataK

Along with the following error

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return
code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183): [../../../src/share/back/
util.c:820]

can anyone tell me the reason & what i need to do to avoid such errors.