# Grin 4.1.1 Crashing **URL:** \ **Category:** Tech Support\ **Created:** [October 27, 2020, 6:05pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925 "2020-10-27T18:05:53Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![MoffNeko](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@MoffNeko](https://forum.grin.mw/u/MoffNeko)\ **Post date:** [October 27, 2020, 6:05pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925/1 "2020-10-27T18:05:53Z")
Hoping someone can assist with a new technical issue I am having: I’ve been mining Grin for about a year now & all has gone well until today. I’m not sure what happened. I think some new update to my firewall caused it to not like some connection my Grin node was making & it’s caused something in the background to go screwy. Here is the sequence of events that I ran into today: 1. I started up Grin 4.1.1 and it started normally 2. Grin was synching up and about 2 minutes in, it crashed. I got a popup from my firewall that said it blocked a connection. That’s never happened before 3. I figured I would troubleshoot the firewall junk later because it’s a pain, so I simply shut it down completely and made sure it was off & then I restarted Grin 4. After about 15 seconds, Grin simply crashed without ever really starting up 5. I repeated a couple of times, same behavior. It simply crashes with no error messages (except in logs) 6. I tried running grin-wallet 4.0.0 just to see if maybe it was behaving odd as well & I also got some error messages there. When I enter my wallet password, it crashes too I am totally guessing blind here, but I figure maybe some file got corrupted when my firewall killed Grin the 1st time, I really don’t know. I’m not sure what to do at this point Looking at my grin-server.log file, it definitely shows some problems. Here is an excerpt: -------trim-------- 20201027 12:22:39.023 INFO grin - This is Grin version 4.1.1 (git v4.1.1), built for x86\_64-pc-windows-msvc by rustc 1.46.0 (04488afe3 2020-08-24). 20201027 12:22:39.023 INFO grin - Chain: Mainnet 20201027 12:22:39.023 INFO grin - Feature: NRD kernel enabled: false 20201027 12:22:39.023 WARN grin::cmd::server - Starting GRIN in UI mode… 20201027 12:22:39.024 INFO grin\_servers:😁:server - Starting server, genesis block: 40adad0aec27 20201027 12:23:27.709 ERROR grin\_util::logger - thread ‘main’ panicked at 'called `Result::unwrap()` on an `Err` value: Chain(Error { inner: NotFoundErr(“Block with hash: 0000918aa0f6”) Store Error: NotFoundErr(“Block with hash: 0000918aa0f6”), reason: DB Not Found Error: Block with hash: 0000918aa0f6 })’: src/bin\cmd\server.rs:58 0: 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: BaseThreadInitThunk 16: RtlUserThreadStart Is this because my wallet was corrupted or something? Should I do a restore? ---
**Author:** ![Paouky](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/paouky/32/513_2.png) [@Paouky](https://forum.grin.mw/u/Paouky)\ **Post date:** [October 27, 2020, 9:48pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925/2 "2020-10-27T21:48:57Z")
I’m not one to resolve the issue, but I might as well suggest that you edit your `grin-server.toml` file such that: `stdout_log_level = "Debug"` and then post the relevant log here again. ---
**Author:** ![MoffNeko](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@MoffNeko](https://forum.grin.mw/u/MoffNeko)\ **Post date:** [October 28, 2020, 1:47pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925/3 "2020-10-28T13:47:18Z")
Yeah, thanks for the suggestion. Done. Slight difference in the output 20201028 09:43:22.383 INFO grin\_util::logger - log4rs is initialized, file level: Info, stdout level: Debug, min. level: Debug 20201028 09:43:22.383 INFO grin - Using configuration file at C:\xxx.grin\main\grin-server.toml 20201028 09:43:22.383 INFO grin - This is Grin version 4.1.1 (git v4.1.1), built for x86\_64-pc-windows-msvc by rustc 1.46.0 (04488afe3 2020-08-24). 20201028 09:43:22.383 INFO grin - Chain: Mainnet 20201028 09:43:22.383 INFO grin - Feature: NRD kernel enabled: false 20201028 09:43:22.383 WARN grin::cmd::server - Starting GRIN in UI mode… 20201028 09:43:22.384 INFO grin\_servers:😁:server - Starting server, genesis block: 40adad0aec27 20201028 09:43:31.302 ERROR grin\_util::logger - thread ‘main’ panicked at 'called `Result::unwrap()` on an `Err` value: Chain(Error { inner: TxHashSetErr: failed to open kernel PMMR })’: src/bin\cmd\server.rs:58 0: 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: BaseThreadInitThunk 16: RtlUserThreadStart ---
**Author:** ![MoffNeko](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@MoffNeko](https://forum.grin.mw/u/MoffNeko)\ **Post date:** [November 2, 2020, 3:28pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925/4 "2020-11-02T15:28:46Z")
Update: So I was able to resolve & get back to mining. Was a pain, but it worked. I had to delete .grin, start over from scratch, and then recover my wallet Thanks for your help, Paouky ---
**Author:** ![Paouky](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/paouky/32/513_2.png) [@Paouky](https://forum.grin.mw/u/Paouky)\ **Post date:** [November 2, 2020, 7:41pm UTC](https://forum.grin.mw/t/grin-4-1-1-crashing/7925/5 "2020-11-02T19:41:15Z")
Glad to hear. Probably was some database corruption, sorry I wasn’t of too much help.