Unable to get property 'get_current' of undefined or null reference: Error in SharePoint App

Root Cause: You might have using wrong object creation in SharePoint App.

Ex: var ccontext = SP.ClientContext.get_current();

Solution:

Use below code.

	var objContext = new SP.ClientobjContext.get_current();
	var objWeb = objContext.get_web();
	var objList = objWeb.get_lists().getByTitle('MyList');
	var objListItemCreation = new SP.ListItemCreationInformation();
	var objNewItem = objList.addItem(objListItemCreation);
	objNewItem.set_item('Title', "Welcome");
	objNewItem.update();
	objContext.load(objNewItem);
	objContext.executeQueryAsync(alert('Success'), alert('fail'));

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