I am new to LoadRunner and I am currently evaluating LoadRunner 7.8, I have read all help/documentation but I couldnít figure out this issue

When I try to record a new script on web application or client server (Oracle/2 tier) I am getting: Error During code generation, The Vuser script was not generated

Then when I hit OK on the above message, I get:

Code generator was aborted, The generator Vuser script may be unusable

Does any one know what this error means? How can I fix it or avoid getting it