I was totally terrified when this happened to my yesterday. I had prepared a little website to use on a SpecFlow demonstration. I had run it several times and it worked fine. But all of a sudden – when I was doing one of those “just checking” it failed on me with this (“The provider did not return a ProviderManifestToken string”) error.
The site was using Entity Framework Code first with SQL CE as described here
Goggling for it didn’t help me to much but I suddenly realized that something was missing. I had used MvcScaffolding to create the database, but I hadn’t added any entries into the .config. Neither had MvcScaffolding but it was totally a slip from me. So I simply added this:
name="[Name from you dbcontext class]"
A few words here:
- When adding this connection string the database got created. You might have to regenerate it (simply update your model to do), I’m not sure about that
- You need the name of the connection string should equal the name of the DbContext class that your using
- What or where the site got it’s data from before this I don’t know. There was no database present in the App_Data-directory before I did this fix.
My demo-site is saved. My demos for SpecFlow run. I am happy!