Some information

Operating system: Windows 11
Java version: openjdk version "11.0.16.1" 2022-08-12 LTS
Minecraft version: 1.16.5
Baritone version: I dont know
Other mods (if used): I use client Wild

Exception, error or logs

latest.log

How to reproduce

Start building a schematic.
download
youtube demonstration

Modified settings

allowInventory true
acceptableThrowawayItems minecraft:granite,minecraft:dirt,minecraft:andesite,minecraft:cobblestone,minecraft:diorite
buildIgnoreBlocks cobblestone
buildIgnoreExisting true
buildIgnoreDirection true
buildInLayers true
legitMine true

Final checklist

• I know how to properly use check boxes
• I have included the version of Minecraft I'm running, baritone's version and forge mods (if used).
• I have included logs, exceptions and / or steps to reproduce the issue.
• I have not used any OwO's or UwU's in this issue.

Recommendation:

Of the more than 50 schematics before 1.12.2, not a single one worked correctly, each of them threw an error similar to the one now. I would really like to build beautiful buildings with Baritone, but damn it doesn't work.

I suggest: adding the ability to skip a problematic block that arises, perhaps this is not feasible, but I would then complete the mistakes for the baritone, at least he would complete this schematic.

In the video it looks like your schematic contains grass in a position where grass cannot be placed.
The message about missing materials for "null" is an old and fixed bug so maybe updating Baritone works. However 1.16.5 is no longer supported so if the last version for 1.16.5 doesn't work then you are out of luck.

You can exclude blocks from the schematic using buildSkipBlocks, replace them with buildSubstitutes, build only part of the schematic using buildOnlySelection and a lot more things, so maybe have a look at the available settings.

Concerning schematics from 1.12.2: They are probably in the old McEdit .schematic format, which Baritone doesn't handle particularly well on 1.13+ so it is best to use a separate tool (Litematica, WorldEdit, online converter, whatever) to convert them to the newer Sponge .schem or Litematica .litematic format.