[1814202.117] [Gameplay] ERROR: no such table: ImprovementModifier
[1814202.117] [Gameplay]: In Query - insert into ImprovementModifier('ImprovementType', 'ModifierId') values (?, ?);
[1814202.117] [Gameplay]: In XMLSerializer while updating table ImprovementModifier from file Data_Resource.xml

I tracked down the code to this folder:
Sid Meier's Civilization VI\Base\Assets\Gameplay\Data\Schema\
This SQL file:
01_GameplaySchema.sql

CREATE TABLE "ImprovementModifiers" (
"ImprovementType" TEXT NOT NULL,
"ModifierID" TEXT NOT NULL,
PRIMARY KEY(ImprovementType, ModifierID),
FOREIGN KEY (ImprovementType) REFERENCES Improvements(ImprovementType) ON DELETE CASCADE ON UPDATE CASCADE);

if you'll note the following in:
289070\1701198033\
file:
Data_Resource.xml

<ImprovementModifier>
<Row>
<ImprovementType>IMPROVEMENT_PASTURE</ImprovementType>
<ModifierId>PASTURE_PANDA_TOURISM</ModifierId>
</Row>
</ImprovementModifier>

The table name is "misspelled". There is an "s" missing at the end of it to make it plural.

My husband and I love love love love pandas!!!!
We are total fans of this mod!
Thank you!
This is such an adorable mod!
Stephanie and Bob