# Grin-miner shows error,please help me

**URL:** https://forum.grin.mw/t/grin-miner-shows-error-please-help-me/2463
**Category:** Mining
**Created:** [January 17, 2019, 6:40am UTC](https://forum.grin.mw/t/grin-miner-shows-error-please-help-me/2463 "2019-01-17T06:40:30Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![bobgnahz](https://avatars.discourse-cdn.com/v4/letter/b/9fc348/32.png) [@bobgnahz](https://forum.grin.mw/u/bobgnahz)
#### Post date: [January 17, 2019, 6:40am UTC](https://forum.grin.mw/t/grin-miner-shows-error-please-help-me/2463/1 "2019-01-17T06:40:30Z")

</div>

I have two rtx2080ti cards, ubuntu server 18.04 OS, when run grin-miner, the shell show the error:

Thread ‘unnamed’ panicked with message:  
“called `Option::unwrap()` on a `None` value”  
See grin.log for further details.  
Jan 17 06:29:13.792 ERRO  
thread ‘unnamed’ panicked at ‘called `Option::unwrap()` on a `None` value’: libcore/option.rs:355stack backtrace:  
0: 0x55682b0fa8fd - backtrace::backtrace::trace::h6a895d5d279a8d2f  
1: 0x55682b0f9b12 - \<backtrace::capture::Backtrace as core::default::Default\>::default::h03a8d770395d927e  
2: 0x55682b0f9b89 - backtrace::capture::Backtrace:🆕:h2eb1c11c92f206be  
3: 0x55682b0ce6f0 - grin\_miner\_util::logger::send\_panic\_to\_log::{{closure}}::h2af0d412bce13617  
4: 0x55682b127216 - std::panicking::rust\_panic\_with\_hook::hde420d6fd4455550  
at libstd/panicking.rs:480  
5: 0x55682b126d61 - std::panicking::continue\_panic\_fmt::h8f394f3c578bcc76  
at libstd/panicking.rs:390  
6: 0x55682b126c45 - rust\_begin\_unwind  
at libstd/panicking.rs:325  
7: 0x55682b16d90c - core::panicking::panic\_fmt::hca5dc4e8b320bc56  
at libcore/panicking.rs:77  
8: 0x55682b16d83b - core::panicking::panic::hca17aeb7dac42859  
at libcore/panicking.rs:52  
9: 0x55682b0b29ea - cuckoo\_miner::miner::miner::CuckooMiner::solver\_thread::hb1fcc4a4bd01fca3  
10: 0x55682b0bdaf3 - std::sys\_common::backtrace::\_\_rust\_begin\_short\_backtrace::hcf79c3268d4dbfbf  
11: 0x55682b0ba838 - std::panicking::try::do\_call::h6ff9bd317a676021  
12: 0x55682b1372a9 - \_\_rust\_maybe\_catch\_panic  
at libpanic\_unwind/lib.rs:102  
13: 0x55682b0befad - \<F as alloc::boxed::FnBox\>::call\_box::h94a600f864e1afe3  
14: 0x55682b12466d - \<alloc::boxed::Box\<(dyn alloc::boxed::FnBox\<A, Output=R\> + 'a)\> as core::ops::function::FnOnc  
e\>::call\_once::h9d902c911a417e39  
at liballoc/boxed.rs:682  
- std::sys\_common:🧵:start\_thread::h44127e03e78ca137  
at libstd/sys\_common/thread.rs:24  
15: 0x55682b115985 - std::sys::unix:🧵🧵🆕:thread\_start::h8f17b97f2223146c  
at libstd/sys/unix/thread.rs:90  
16: 0x7f6e1a1276da - start\_thread  
17: 0x7f6e19c3888e - \_\_clone  
18: 0x0 -

 

after that, one rtx2080ti card work normal, another one not work. but two cards work well yesterday. please help me, thanks.