!setBlockIndexCandidates.empty() !setBlockIndexCandidates.empty() Bitcoin Core 0.11 error

Hello, 

I have a problem with the Bitcoin Core v. 0.11 software!!!

I installed the software today and after a long wait (downloading block source - 5 years) I closed the application and when I tried to start it again I received this error: 

"Assertion failed!
File: main.cpp, Line 2287
Expression: !setBlockIndexCandidates.empty()"

If I click Ignore on the error window the program start but with "No block source available" so it can't continue the download. And when I close the program I receive a FATAL ERROR message: "see debug.log for details"

Can somebody tell me how do I fix this error or what do I do next?
And another thing... 
I was sent today some Bitcoins and I am asking if the sun can be recovered somehow?

Thanks!

debug.log
I had exactly the same problem with litecoin 0.15.1 and it helped me to run it with --reindex option on the command line. I only had to do it once...