First check all the INVALID objects in the schema using :

select OBJECT_NAME OBJECT_TYPE from user_objects where status 'INVALID';

compile the objects accordingly....

ALTER PACKAGE my_package COMPILE;

ALTER PACKAGE my_package COMPILE BODY;

ALTER PROCEDURE my_procedure COMPILE;

ALTER FUNCTION my_function COMPILE;

ALTER TRIGGER my_trigger COMPILE;

ALTER VIEW my_view COMPILE;

Regards

VijayRaju