The build finished but some items "couldn't be changed"
Those items are locked away from the bot: channels hidden from everyone or roles that sit above the bot's own role. Move the bot's role to the top of the role list and grant it access to the hidden channels, then press Retry the failed items. Giving the bot Administrator also works, since it bypasses both locks.
I gave YourBot the right permissions but the build still fails
If your server runs its own custom bot, the builder works through that bot instead of the shared YourBot. Check the building as @bot badge on the design page: the bot it names is the one that needs the permissions.
Will building delete my channels or messages?
Not unless you explicitly ask it to. Builds add and organize by default; every deletion is an unchecked box you have to check yourself, plus a confirmation that the deletion is permanent. Checked deletions do permanently remove those channels and their message history, so read that list carefully.
Can I undo a build?
Yes, structurally. Undo build recreates the channels, categories and roles from the snapshot taken just before the build, with their permissions and settings. Restored channels come back empty because Discord cannot restore deleted messages. You can also download the backup as a file.
Why can't my moderators open Start Your Server?
The builder is owner-only by design. It can restructure the entire server including deletions, so it is limited to the server owner and can't be granted to managers from the Access page.
It says a design is already running
Only one design runs per server at a time, so two messages sent together don't produce two conflicting layouts. Give it a moment to finish and send again. If a build was interrupted mid-way (for example by a restart), the plan page says so, and Build again safely finishes the job while skipping everything that already exists.
The chat described things that aren't in the layout
The layout panel is what actually gets built, so always check it before building. If it's missing something the chat promised, say so ("you only added roles, include the channels you described") or ask for a smaller design; very large designs can get cut off, and the AI warns you in chat when that happens.
Do I get charged when something goes wrong?
No. If a design fails, times out or can't be saved, the full hold is refunded before you're told and the message ends with "Nothing was charged." Failed attempts don't use up free designs either.