Welcome to the forum. The cannot locate part files error message means just that. The most common cause is when part or sub-assembly files are moved or re-named after being used in an assembly. I don't know if that's the case in your situation.
Further to Glenn's comment. If you have moved or renamed the part files, when the pop up appears it asks if you would like to find the parts yourself.
Once you navigate to the new part file location, SWKs remembers this, so you should have no further problems.
Assuming you're not using a work group PDM system.
When you create new parts, save them directly to the server, then build the assembly so the references will be correct from the start.
Thank you very much guys. Adrian, when you said "save directly to the server" that made me think about something. The problem was with how I opened the file. For example, if I opened solid works and tried to open the assembly I would get the errors I described above. If I went to the folder, for example: "Libraries\Documents\Solid Edge\Assembly" and tried to open the assembly, the same problem occured. However, if I went to the server and then navigated to the folder, such as: "Computer\ servername\documents\Solid Edge\Assembly" then the asssembly opened perfectly. Why this happens I do not know, but I guess it has something to do with the server. If my explanation isn't clear, let me know. I hope this helps anybody else that has a similair issue. Thanks Again!!
No problem Ben, that's why the forums exist.
I'm pretty sure I know what you mean.
I stil think you should try to open the files as I said though and set the references otherwise SWKs can open multiple copies of the program if you double click to open the file from a server.
It could save you a lot of time in the future.
Don't forget to mark replies as correctly answered as it helps others in the same situation...
Just a note. It may be best to use Solidworks Explorer if you want to move files or rename files. That way it will know where to look for those files when you open your assemblies.