I think it's from the "bucket miner" mod, but not 100% sure.

The mod Mining patch planner (1.0.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event mining-patch-planner::on_player_cursor_stack_changed (ID 30)
Unknown sprite "item/bucketw"
stack traceback:
[C]: in function 'add'
mining-patch-planner/gui.lua:29: in function 'build_miner_table'
mining-patch-planner/gui.lua:75: in function 'build_interface'
mining-patch-planner/control.lua:25: in function <mining-patch-planner/control.lua:21>

Can confirm: related to bucket excavator mod.

Disabled bucket mod and this mod worked fine.

Hopefully you can update it to include the bucket wheel, if not, no worries, it's a pretty great mod as is!

Thanks.

Thanks for the report. Crash fixed.
Bucket miners also work for placement but on small patches you might get mixed results.

Groovy!

Thanks for the reply and the fix.

Much appreciated.