The error message tells you exactly what's wrong. You are calling the ScannedDocuments constructor without passing in any parameters, and it seems that the class expects an int and three Strings to be passed in. Since you have this class and we don't, you'll have to figure out how best to fix this.
i have deleted 'private' and now it gave me the following error:
C:\Documents and Settings\User\Desktop\STC\Assignments\Java\ACTUAL CODE\Tester.java:9: error: constructor ScannedDocuments in class ScannedDocuments cannot be applied to given types;
ScannedDocuments sc = new ScannedDocuments();
found: no arguments
reason: actual and formal argument lists differ in length