I am using Developer edition to upload my package. 

It works perfectly fine if I upload umanaged pacakge.

But when I enable manged packaging and try to upload then I get following error:

Package upload error
There are problems that prevent this package from being uploaded.

We couldn't validate your component. Review it and try again.

I have been struggling a lot for a very long time but still could not find any clue. 

Any help would be very appreciated. 

Thanks in advance

I am using Developer edition to upload my package. 

It works perfectly fine if I upload umanaged pacakge.

But when I enable manged packaging and try to upload then I get following error:

Package upload error
There are problems that prevent this package from being uploaded.

We couldn't validate your component. Review it and try again.

I have been struggling a lot for a very long time but still could not find any clue. 

Any help would be very appreciated. 

Thanks in advance