I opened my Bitcoin Core program today on my Windows 7 PC via an external hard disk (1 TB) and I found the following error:
MinGW Runtime Assertion
File: chain.cpp, line 103
Expression: pindexWalk-> pprev
DEBUG LOG: http://pastebin.com/YNEuRAcv
How do I fix this error without losing the blocks on my external hard disk which I have synchronized for months?