The mod Upgrade Builder and Planner (2.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event upgrade-planner-next::on_configuration_changed
Unknown sprite "utility/remove"
stack traceback:
upgrade-planner-next/upgrade-planner/gui.lua:133: in function 'open_frame'
upgrade-planner-next/control.lua:58: in function 'verify_all_configs'
upgrade-planner-next/control.lua:78: in function 'handler'
stdlib/stdlib/event/event.lua:321: in function 'pcall'
stdlib/stdlib/event/event.lua:341: in function 'dispatch_event'
stdlib/stdlib/event/event.lua:424: in function 'dispatch'
stdlib/stdlib/event/event.lua:82: in function <stdlib/stdlib/event/event.lua:80>
stack traceback:
[C]: in function 'add'
upgrade-planner-next/upgrade-planner/gui.lua:133: in function 'open_frame'
upgrade-planner-next/control.lua:58: in function 'verify_all_configs'
upgrade-planner-next/control.lua:78: in function 'handler'
stdlib/stdlib/event/event.lua:321: in function 'pcall'
stdlib/stdlib/event/event.lua:341: in function 'dispatch_event'
stdlib/stdlib/event/event.lua:424: in function 'dispatch'
stdlib/stdlib/event/event.lua:82: in function <stdlib/stdlib/event/event.lua:80>

have a good one

WIll be tracked in https://github.com/Roang-zero1/upgrade-planner-next/issues/9
Unfortunately I won't be able to fix this till the weekend.

Please fix asap

Manual fix:
1. Unpack upgrade-planner-next_2.1.0 into mods directory.
2. Go to the unpacked folder, open upgrade-planner/gui.lua in notepad.
3. Find "utility/remove" and replace it with "utility/trash_bin"

Thanks for the fix, could you maybe open a pull request against the repository? Then I can release via github!

Pull request is open, it's just a change in file though.

Thanks, New version is released.