Resource not found error in XI 3.0

Hi Experts,

My scenario is to take CSV file and convert it to XML file. for that i wrote a java mapping code. but when i import and test in XI Integration Repository an error is trowing out as below

02:41:17 Start of test 

•   Unable to find resource com/sap/aii/mapping/api/AbstractTransformation.class (https://sample.nestle.com, -1) in the following software component versions: 158325c0-cb65-11e5-ba4e-d7368d7a0264 

02:41:18 End of test    

a part of java code - - -

public void transform(TransformationInput tip, TransformationOutput top)throws StreamTransformationException

   {

  InputStream in = tip.getInputPayload().getInputStream();

  OutputStream out = top.getOutputPayload().getOutputStream();

  try

  {

    BufferedReader br = new BufferedReader(new InputStreamReader(in));

     while((line = br.readLine()) != null)

     {

I tested in sandbox XI 3.0 system.

please give me some suggestions.