During the normal use of my program, I received the following error message:

"Shared Memory Provider: No process is on the other end of the pipe. **Unable to open a logical session**"

After getting this error I noticed that my program was unable to read the data from the SQL tables.
The only thing that helped was recovering some of my DB tables again

My question is: What does this SQL error mean? What could be the reason this started happening (It worked great for years with no problem)?