The error is fortunately easy to address: the movie file is not where you are telling PsychoPy it is.
The biggest problem here is likely the use of an absolute path: because they are so long, they are easy to get wrong, and using the Windows backslash can cause problems. So:
- Use
/separators instead of\. - Use relative paths instead of absolute paths.
A relative path doesn’t start with c:/. Instead it is relative to the location of your .psyexp Builder file. So if the movie is in the same folder, just refer to it by name, i.e. klip avi.avi. If it is in a sub-folder of that folder (called, say, videos), then you could refer to it like this: videos/klip avi.avi (note the forward slash). Relative paths also have the advantage that you can move the experiment files to another folder, or even another computer, and the experiment will still work.
Lastly, Windows can hide the file extensions from you. So a file that looks like it is called klip avi.avi could actually be klip avi.avi.avi unless you have Windows set to show all file extensions.