Hello,
Recently, I was looking for more life to my music videos. However, during the process of making video, I want to add some effects like rain, blinking lights, ... to make my video more impressive. But I got an error. Since this is my first time doing this, I don't know what kind of mistake I'm making.
Can someone help me with this problem?
Thanks for all the help.

Can you describe what kind of error you are getting? Also, which version of kdenlive on what OS you are running? Sreenshots also help with understanding what you are doing and what the error is or what may cause it.

To add to what berndmj said, what do you mean by rain effect? I can't see anything other than an overlay in which case I don't see how it could bring out an error.