>Hi Friends
>
>I got the message above occasionally, I can not Build the project
>For me the only way to correct this is to create a new project and copy all to this project. Is there a better way.
>
>What could be the reason
>
>"Memo file c:\.......\Project_name.pjt is missing or is invalid

Uh-oh...this is a good time to say, where's your backup? Time to start keeping one, if you're not yet. But if you don't have one, you can try to open the pjx as a table, and see what happens. If it opens okay, you can look at the memos (I forget which fields), but look for some garbage/bad characters. somewhere...it's not that difficult to create a new one anyway, if worst comes to worst...