How to solve a Null Pointer Exception

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Android

Hello,
I have encountered an error after adding a third activity to my code. The code generating the error is the following:

public void onClick(View v) {
				Intent callIncomeIntent = new Intent(v.getContext(), Add_Income.class);
				startActivityForResult(callIncomeIntent, 0);
			}
		});

Generates error :
E/AndroidRuntime(13211): java.lang.RuntimeException: Unable to start activity ComponentInfo{tei.ptix.income_management/tei.ptix.income_management.Add_Income}: java.lang.NullPointerException

When I hover mouse over Intent it givees the following text:
android.content.Intent.Intent(Context packageContext, Class
Note: This element has no attached source and the Javadoc could not be found in the attached Javadoc.

Can someone please suggest a solution?
Thanks in advance.