My BlackBerry 8310 Curve device had problems with RIM "Desktop Manager" software, executing IntelliSync module that takes care about data sync with my Notes R8 client.
Problem was I could not sync contacts/calendar entries from my Lotus Notes installation: the log file just contained an error message with code # 4238.
My Notes "Home" location settings just pointed to server "Local" and to mailbox file "mail\mymailbox.nsf", as usual...
After a quick search I found the following RIM Support document Doc ID: KB01870
"Internal Error 4238 Transaction Cancelled"
As suggested by the doc, I just changed my location settings specifying my mailbox file location as "c:\lotus\notes\data\mail\mymailbox.nsf".
It works, finally.