# Having problems when starting zcashd

**URL:** <https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193>\
**Category:** Mining\
**Created:** [October 24, 2016, 10:02pm UTC](https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193 "2016-10-24T22:02:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![the\_miner](https://avatars.discourse-cdn.com/v4/letter/t/a4c791/32.png) [@the\_miner](https://forum.zcashcommunity.com/u/the_miner)\
**Post date:** [October 24, 2016, 10:02pm UTC](https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193/1 "2016-10-24T22:02:01Z")

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I’m having issues with -equihashsolver (at least I think it’s an issue with that). First of all I’ve been using zminer to mine in the [zmine.io](http://zmine.io) pool, and when I run the command:

> ./src/zcash-miner -stratum=stratum+tcp://zmine.io:1337 -user=tmGUdN9CE1wNb7znydNHYiyw8VzqmApnLrp -equihashsolver=tromp -genproclimit=-1

to start mining on [zmine.io](http://zmine.io), everything works fine, and tromps solver runs with no issues. However if I try to start mining alone using:

> ./src/zcashd -daemon -equihashsolver

It doesn’t successfully start the server, and it throws this error:

> zcashd: miner.cpp:461: void BitcoinMiner(CWallet\*): Assertion ‘solver == “tromp” || solver == “default”’ failed.

Also, if I run:

> ./src/zcashd -daemon

everything works fine. I’m not sure what is going on here, any of you know how to fix this?

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**Author:** ![Quent17](https://avatars.discourse-cdn.com/v4/letter/q/47e85d/32.png) [@Quent17](https://forum.zcashcommunity.com/u/Quent17)\
**Post date:** [October 24, 2016, 10:43pm UTC](https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193/2 "2016-10-24T22:43:37Z")

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Can you copy/paste your zcash.conf file ?

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**Author:** ![JanKalin](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@JanKalin](https://forum.zcashcommunity.com/u/JanKalin)\
**Post date:** [October 24, 2016, 10:56pm UTC](https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193/3 "2016-10-24T22:56:48Z")

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> [@the\_miner](#):
>
> to start mining on [zmine.io](http://zmine.io), everything works fine, and tromps solver runs with no issues. However if I try to start mining alone using:
> 
> ./src/zcashd -daemon -equihashsolver
> 
> It doesn’t successfully start the server, and it throws this error:

If you do not use `-equihashsolver` parameter, the solver defaults to `default`. But if you _do_ use it, you need to specify the value, either `default` or `tromp`.

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<div class="post-metadata">

**Author:** ![the\_miner](https://avatars.discourse-cdn.com/v4/letter/t/a4c791/32.png) [@the\_miner](https://forum.zcashcommunity.com/u/the_miner)\
**Post date:** [October 24, 2016, 11:17pm UTC](https://forum.zcashcommunity.com/t/having-problems-when-starting-zcashd/3193/4 "2016-10-24T23:17:30Z")

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@JanKalin Ohhhh wow. Stupid mistake on my part, thanks!