Windows .exe Annoying crash when starting/ reloading a world

  • The FTB Forum is now read-only, and is here as an archive. To participate in our community discussions, please join our Discord! https://ftb.team/discord
the file:
Code:
C:\Users\Tim\Desktop\FTB\Direwolf20_1_6_4\minecraft\saves\Stream\chickenchunks\loginTimes.dat
is open in another program.

try downloading the Windows Sysinternals Process Explorer from here: http://technet.microsoft.com/en-gb/sysinternals/bb896653.aspx
its a stand alone EXE that you just run. its basically a super charged task manager.
once you have it open (make sure you run it as admin), and have minecraft running, press CTRL+F and paste this in to the search box

Code:
C:\Users\Tim\Desktop\FTB\Direwolf20_1_6_4\minecraft\saves\Stream\chickenchunks\loginTimes.dat

then press search. it will give you a list of processes that are using that file (in my case, just javaw.exe)
 
then its the same problem. the game is trying to save some data to that file, but it cant because some other program has the file locked. you need to try to find what that program is :/