Hi Vikas,
This message is shown when there are several objects in your application that match the specified mapping criterion. If you map your object using this criterion and try to access it from your script, TestComplete will search for the object using the mapping scheme and will use the first found object. If it's not the needed object, most likely, the test will fail.
So, to solve the problem, I recommend that you change the mapping criterion so that there weren't problems with objects identification in the future. That is, make sure that there is only one object that matches each specified mapped criterion.