cant install using portainer about kapowarr HOT 4 CLOSED

Ah, right - if you do this with a named volume (- 'kapowarr-db:/app/db') then it has to exist prior to starting the container.
To make it in portainer:

• Open Volumes
• Click Add Volume
• Enter name matching the one you'll use in compose (kapowarr-db)
• Click Create the volume
• Open Stacks
• Create the stack with the named volume in it.

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Added this to docs for future enquiries, in PR #49

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It didnt help.
I followed those steps, made volume but I still have same problem

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If you look at the volumes page in portainer after creating the volume, can you see the new one there?
I've seen portainer throw errors when the UI for it is cached in your browser (like the site knew the volume didn't exist, so it won't even check with the docker engine to see if that's changed). Pressing ctrl + f5 should clear your browser cache and reload it fresh.

Once that's cleared, confirm the volume still exists (create it if it doesn't), then go to stacks and create it fresh. Don't do it across multiple tabs, the cache will start to pollute between them.

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