I have used third party component i.e. ocx in my vb application when i made it. it was working properly for last many months and i can do change in applicatin and make new exe as well but from last two days i cant make new exe or save any changes. after loading project when i try to open form in which i used that ocx it gives me error " Run-time error '440': Automation Error" so i just download new ocx from site and register new ocx and unregister old one. but even still it gives me same error and i cant open form for changes. plz help me out.

Try these in the this order:

1) Check what changes you have made in the project before you started having this problem.

2) Try removing the component from the form, and remove its reference fromt the Controls. Save and exit VB. StartVB, add the component again.

3) is that a legally purchased component? See if you can write a "minimal" project that replicates the proble, and send it to the vendor.

Let us know.
Marco