Error: too many outstanding generations between checkpoint and current generation

Jul 19, 2013 at 6:40 PM
I am using version 1.6 because i do not have dot net 4.5 installed.
I received this error after I added about 2,000,000 items to the dictionary.

Error: too many outstanding generations between checkpoint and current generation

Any help with this error would be appreciated.
Thanks for your help,
Mark