# NNS Canister error when asking for details **URL:** https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267 **Category:** Developers **Tags:** nns **Created:** [April 4, 2023, 2:56am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267 "2023-04-04T02:56:20Z") **Posts on this page:** 20 **Page:** 1
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 2:56am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/1 "2023-04-04T02:56:20Z")
I am getting this message when trying to access a canisters details, created on the NNS. “Sorry, there was an error loading the details of the canister. Please try again later.” So I am coming back days later and still gives me the same error. Thanks for any help. ---
### Author: ![peterparker](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@peterparker](https://forum.dfinity.org/u/peterparker) #### Post date: [April 4, 2023, 5:14am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/2 "2023-04-04T05:14:51Z")
With “created on the NNS” do you mean created in NNS-dapp or something else? Can you share a bit more details of the steps you performed to create the canister, assuming you created a canister right? On mainnet correct? ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 10:41am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/3 "2023-04-04T10:41:16Z")
Yes I created the canister on the nns-dapp. I then used my principal id to gain control locally with dfx. I then think I deleted what I had deployed initially. After this I have had the error. ---
### Author: ![peterparker](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@peterparker](https://forum.dfinity.org/u/peterparker) #### Post date: [April 4, 2023, 11:13am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/4 "2023-04-04T11:13:17Z")
> [@paulous](#): > > I then think I deleted what I had deployed initially. Thanks for the feedback. Is your NNS-dapp principal still a controller of your canister? ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 11:15am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/5 "2023-04-04T11:15:57Z")
Sorry I should say that I changed the canister principal to my local principal. ---
### Author: ![peterparker](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@peterparker](https://forum.dfinity.org/u/peterparker) #### Post date: [April 4, 2023, 11:42am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/6 "2023-04-04T11:42:17Z")
So if I understand correctly, your principal in NNS-dapp is not a controller of your canister anymore. If yes, that’s the reason why the dapp cannot fetch the details of the canister, only controllers can get get the details of a canister and that’s why you get the error message. ---
### Author: ![Vivienne](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/vivienne/32/29170_2.png) [@Vivienne](https://forum.dfinity.org/u/Vivienne) #### Post date: [April 4, 2023, 11:51am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/7 "2023-04-04T11:51:47Z")
You are not limited to having only one controller. If you add your NNS principal to it (instead of replacing it) you can see its details in the NNS dapp again. To add a controller via dfx, use this command: `dfx canister update-settings --add-controller ` ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:00pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/8 "2023-04-04T12:00:17Z")
Do I have to use --network=ic with that? ---
### Author: ![peterparker](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@peterparker](https://forum.dfinity.org/u/peterparker) #### Post date: [April 4, 2023, 12:03pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/9 "2023-04-04T12:03:57Z")
> [@Vivienne](#): > > You are not limited to having only one controller. Worth to note, it’s max 10 controllers ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:04pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/10 "2023-04-04T12:04:45Z")
Thanks for the explanation and the advice about multiple controllers. I will give it a go. ---
### Author: ![Vivienne](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/vivienne/32/29170_2.png) [@Vivienne](https://forum.dfinity.org/u/Vivienne) #### Post date: [April 4, 2023, 12:30pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/11 "2023-04-04T12:30:56Z")
Yes, you need to use `--network ic` (with or without a `=` in between. It works either way) ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:33pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/12 "2023-04-04T12:33:03Z")
I get this error: Error: Failed to get canister status of qrjtn-liaaa-aaaap-qa4pq-cai. Caused by: Failed to get canister status of qrjtn-liaaa-aaaap-qa4pq-cai. Failed to call update function ‘canister\_status’ regarding canister ‘qrjtn-liaaa-aaaap-qa4pq-cai’. Update call (without wallet) failed. The replica returned an HTTP Error: Http Error: status 404 Not Found, content type “application/cbor”, content: Canister qrjtn-liaaa-aaaap-qa4pq-cai not found ---
### Author: ![Vivienne](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/vivienne/32/29170_2.png) [@Vivienne](https://forum.dfinity.org/u/Vivienne) #### Post date: [April 4, 2023, 12:35pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/13 "2023-04-04T12:35:52Z")
This means either a) the canister is deleted or b) you’re on the wrong network (e.g. you forgot `--network ic`) ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:37pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/14 "2023-04-04T12:37:24Z")
If the canister is deleted is there a way to get it back or it’s gone for good? ---
### Author: ![Vivienne](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/vivienne/32/29170_2.png) [@Vivienne](https://forum.dfinity.org/u/Vivienne) #### Post date: [April 4, 2023, 12:40pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/15 "2023-04-04T12:40:45Z")
If it’s gone it’s gone. No way to bring it back, and also no way to get that canister ID ever again so nobody can impersonate that canister at a later point in time ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:49pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/16 "2023-04-04T12:49:01Z")
Slightly disconcerting as I don’t know exactly what I did to delete it. Anyway thanks for your help. I will need to be more careful in future. ---
### Author: ![Vivienne](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/vivienne/32/29170_2.png) [@Vivienne](https://forum.dfinity.org/u/Vivienne) #### Post date: [April 4, 2023, 12:52pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/17 "2023-04-04T12:52:15Z")
I don’t know about the NNS dapp, but via dfx the only way to delete a canister is with the `dfx canister delete` command, so I’m really not sure what could have happened if you didn’t do it on purpose… ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 4, 2023, 12:57pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/18 "2023-04-04T12:57:42Z")
I don’t have a strong handle on what I am doing yet. I wanted to over-write the project I had on the canister and may have unwittingly deleted the canister instead. ---
### Author: ![peterparker](https://avatars.discourse-cdn.com/v4/letter/p/b9bd4f/32.png) [@peterparker](https://forum.dfinity.org/u/peterparker) #### Post date: [April 4, 2023, 1:04pm UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/19 "2023-04-04T13:04:04Z")
> [@Vivienne](#): > > I don’t know about the NNS dapp, User cannot delete canister in NNS-dapp. Unlink is possible and deleting/removing controllers but, not deleting canisters. ---
### Author: ![paulous](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulous/32/4209_2.png) [@paulous](https://forum.dfinity.org/u/paulous) #### Post date: [April 5, 2023, 7:13am UTC](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267/20 "2023-04-05T07:13:21Z")
Yes it’s odd to me because the canister id is still active and linked in the nns-dapp but I can’t get any details to change controllers etc. [Next page](https://forum.dfinity.org/t/nns-canister-error-when-asking-for-details/19267.md?page=2)