It looks like Loading Screen Mod is broken in the latest version, but the fix is another mod: LSM for Airports. With LSM for Airports subscribed (and original LSM unsubscribed), I'm able to get the following report when trying to start the game.

Thanks for any help!

Elba
Assets report for Cities: Skylines.
To stop saving these files, disable the option "Save assets report" in Loading Screen Mod.


Assets that failed to load
Buildings and parks
1x1Romanlvl1lowresI


Asset errors
Problems were detected in these assets.
washington square arch
Extremely large LOD mesh 17136 vertices


Asset warnings
Warnings were raised about these assets.
1x1Romanlvl1lowresK
Very large LOD texture 1024 x 1024
1x1Romanlvl1lowresL
Very large LOD texture 1024 x 1024
2x2Romanlvl1lowresA
Very large LOD texture 1024 x 1024
Arco della Repubblica - Florence
Very large LOD mesh 698 triangles
Atlas (Left)
Very large LOD mesh 910 triangles
Atlas (Left) - 10m
Very large LOD mesh 910 triangles
Atlas (Left) - 20m
Very large LOD mesh 910 triangles
Atlas (Left) - 40m
Very large LOD mesh 910 triangles
Atlas (Right)
Very large LOD mesh 910 triangles
Atlas (Right) - 10m
Very large LOD mesh 910 triangles
Atlas (Right) - 20m
Very large LOD mesh 910 triangles
Atlas (Right) - 40m
Very large LOD mesh 910 triangles
Field Wheat Cut Network 3
Very large LOD texture 256 x 1024
Field Wheat Network 3
Very large LOD texture 256 x 1024
Field Wheat Young Network
Very large LOD mesh 960 triangles
Gedenkbrunnen
Very large LOD mesh 1007 vertices
Gutemberg monument
Very large LOD mesh 1014 vertices
Knabe Vogel Statue
Very large LOD mesh 622 triangles
Lion I
Very large LOD mesh 1005 triangles
Lion II
Very large LOD mesh 1004 triangles
Madeleine Filippos
Very large LOD texture 512 x 512
Very large LOD mesh 832 triangles
Railyard Retaining Wall 03 EF
Very large LOD mesh 624 triangles
Stone city wall - open
Very large LOD mesh 744 triangles
Very large LOD mesh 1022 triangles
washington square arch
Very large LOD mesh 1438 triangles
Very large LOD mesh 4809 vertices
Very large LOD mesh 4702 vertices


Assets that are missing
There are two reasons for an asset to appear in this section: (1) The asset is placed in the city but is missing (2) The asset is used by some other asset but is missing.
Props in buildings, parks and nets
Adult Vagrant Man
Used by:
1x1Romanlvl1IndustryA
RomStallCloth
Used by:
1x1Romanlvl1lowcomD

Asset bug: Workshop asset uses private asset (RomStallCloth.RomStallCloth_Data)
Spot Light Yellow
Used by:
Lugo_RomanWall_Corner1
Lugo_RomanWall_Corner2
Lugo_RomanWall_Corner3
Lugo_RomanWall_Gate1
Lugo_RomanWall_Gate2
Lugo_RomanWall_Gate3
Lugo_RomanWall_Granite1
Lugo_RomanWall_Granite2
Lugo_RomanWall_Granite3
Lugo_RomanWall_Granite4
Lugo_RomanWall_Granite5
Lugo_RomanWall_Stairs1
Lugo_RomanWall_Stairs2
Lugo_RomanWall_Stairs3
Lugo_RomanWall_Stairs4
Lugo_RomanWall_Tower1
Lugo_RomanWall_Tower2
Lugo_RomanWall_Tower3
Lugo_RomanWall_Tower4
Lugo_RomanWall_Tower5
Lugo_RomanWall_Tower6
Lugo_RomanWall_Tower7
Lugo_RomanWall_Wall
Lugo_RomanWall_Wall3
Lugo_RomanWall_Wall4
Lugo_RomanWall_Wall5
Lugo_RomanWall_Wall6
Wall Lantern Type-01
Used by:
Lugo_RomanWall_Gate1
Lugo_RomanWall_Gate3
Wall Lantern Type-03
Used by:
Lugo_RomanWall_Gate1
Trees in buildings, parks and nets
Canary Island Date Palm Tall
Used by:
Pool of Aphrodite
Tree Fern
Used by:
Pool of Aphrodite


Duplicate asset names
1407617089.Madeleine Sub 1_Data
Same asset name (1407617089.Madeleine Sub 1_Data) in all of these:
Madeleine Filippos
Madeleine Sub 1
2674210208.HighwayRampElevated0
Same asset name (2674210208.HighwayRampElevated0) in all of these:
Field Network 0
Field Wheat Cut Network 3
Field Wheat Young Network
2674210208.HighwayRampElevated1
Same asset name (2674210208.HighwayRampElevated1) in all of these:
Field Network 0
Field Wheat Cut Network 3
Field Wheat Young Network
2674210208.HighwayRampPillar
Same asset name (2674210208.HighwayRampPillar) in all of these:
Field Network 0
Field Wheat Network 3
Field Wheat Cut Network 3
Field Wheat Young Network


The following custom assets are used in this city
No used assets.


The following enabled assets are currently unnecessary (not used in this city)
There are two reasons for an asset to appear in this section: (1) The asset is enabled but unnecessary (2) The asset is included in an enabled district style but is unnecessary.
Buildings and parks
1v1Romanlvl1lowresCornerA
1v1Romanlvl2lowresCornerA
1x1 invisible underground cable
1X1Romanlvl1highresA
1X1Romanlvl1highresB
1X1Romanlvl1highresC
1X1Romanlvl1highresD
1X1Romanlvl1highresE
1x1Romanlvl1IndustryA
1x1Romanlvl1lowcomA
1x1Romanlvl1lowcomB
1x1Romanlvl1lowcomC
1x1Romanlvl1lowcomD
1x1Romanlvl1lowcomE
1x1Romanlvl1lowcomF
1x1Romanlvl1lowresA
1x1Romanlvl1lowresB
1x1Romanlvl1lowresC
1x1Romanlvl1lowresD
1x1Romanlvl1lowresE
1x1Romanlvl1lowresF
1x1Romanlvl1lowresG
1x1Romanlvl1lowresH
1x1Romanlvl1lowresI
1x1Romanlvl1lowresJ
1x1Romanlvl1lowresK
1x1Romanlvl1lowresL
1x2Romanlvl1IndustryA
1xaRomanlvl1lowresH
2v2Romanlvl1lowresCornerA
2v2Romanlvl2lowresCornerA
2x2Romanlvl1lowresA
2x2Romanlvl1lowresB
2x2Romanlvl1lowresC
2x2Romanlvl1lowresD
2x2Romanlvl1lowresE
2x2Romanlvl1lowresF
2x2Romanlvl1lowresG
2x2Romanlvl1lowresH
Aquila Power Projection
Arco della Repubblica - Florence
Atlas (Left)
Atlas (Left) - 10m
Atlas (Left) - 20m
Atlas (Left) - 40m
Atlas (Right)
Atlas (Right) - 10m
Atlas (Right) - 20m
Atlas (Right) - 40m
CableStay32m
cloaca minima
Column of Constantine
Gedenkbrunnen
Gutemberg monument
Italian Romanesque Parish Church
Knabe Vogel Statue
Lion I
Lion II
Lugo_RomanWall_Corner1
Lugo_RomanWall_Corner2
Lugo_RomanWall_Corner3
Lugo_RomanWall_End1
Lugo_RomanWall_End2
Lugo_RomanWall_Gate1
Lugo_RomanWall_Gate2
Lugo_RomanWall_Gate3
Lugo_RomanWall_Granite1
Lugo_RomanWall_Granite2
Lugo_RomanWall_Granite3
Lugo_RomanWall_Granite4
Lugo_RomanWall_Granite5
Lugo_RomanWall_Stairs1
Lugo_RomanWall_Stairs2
Lugo_RomanWall_Stairs3
Lugo_RomanWall_Stairs4
Lugo_RomanWall_Tower1
Lugo_RomanWall_Tower2
Lugo_RomanWall_Tower3
Lugo_RomanWall_Tower4
Lugo_RomanWall_Tower5
Lugo_RomanWall_Tower6
Lugo_RomanWall_Tower7
Lugo_RomanWall_Wall
Lugo_RomanWall_Wall2
Lugo_RomanWall_Wall3
Lugo_RomanWall_Wall4
Lugo_RomanWall_Wall5
Lugo_RomanWall_Wall6
Madeleine Filippos
Madeleine Sub 1
Marble Bust (Police Station)
Market Fountain Aalen
New Asset
Oria Well
Pool of Aphrodite
Roman Park 01
Roman Park 02
Roman Park 03
Roman Park 04
Roman Park 05
Roman Ruins
Roman Statue of Wealth
Roman Style Elementary 01
Roman Style Elementary 02
Roman Style Highschool 01
Roman Style Highschool 02
Roman Style Library 01
Roman Style Library 02
Roman Style University
Romulus and Remus
Stone city wall - left access
Stone city wall - right access
The Artist's Villino
Vecov town well
washington square arch
Wood8mEPillar
Props
Amphora1
Amphora2
Cube
Curtains
Dolium1
Dolium2
Field soil decal
Iron & Copper Brazier
Lugo Bridge 1
Lugo Bridge 2
Lugo Bridge 3
Lugo Bridge 4
Lugo Bridge 5
Market Awning 1 [Paris]
Market Awning 2 [Paris]
Market Awning 3 [Paris]
Market Awning 4 [Paris]
Market Awning 5 [Paris]
Medieval Hand Cart
New Asset
RetractBollard
RoadPlanter1
Roman Chair 3 Variations
Roman Pillar Thin
Roman Statuette 3 Variations
Roman Street Food
RomanTable
RomanTable2
Small Amphora
Small Brazier
Square
Stone Urn Flora 3
Stone Urn Flora1
Stone Urn Flora2
StoneBollard
WoodBollard
zombie
货物 cart crates 1
货物 cart crates 2
货物 cart crates 3
货物 cart crates 4
Trees
Wild Small Bushes
Bush Shrubs
cat_ginger_tom_purring
Cluster of bushes
Cluster of shrubs light
Cluster of weeds brown
Cluster of weeds green
Cypress by pdelmo
Dandelion Weeds
Fern Cluster
Fine tall green small cluster
Fine Tall Lush Grass
Fluffy Grass
Fluffy Grass Dry
Fluffy Grass Dry Short
Fluffy Grass Short
Fruits - Orange tree
Garden Cover
Garden Cover Blue
Garden Cover Pink
Garden Cover Purple
garden cover red
Garden Cover White
Garden Cover yellow
Golden Phragmites
Golden Phragmites Cluster
HorseWeed
HorseWeed Cluster
Hydrangea – Blue
Hydrangea – Pink
Hydrangea – Purple
Hydrangea – White
Lavender bush
Meadow Grass clump
Olive Tree 2
Olive tree 3
Olive Tree by pdelmo
PD- Wild Bush
PD- Wild Bush 2
PD-Bamboo
Reeds 3
Reeds 3 smaller
RiverReeds Detail Edition
RiverReeds Detail Edition cluste
Shady Bush Bloom
Shady Bush Bloom Pink
Shady Bush Bloom White
Shady Bush Orange Bloom
Shady Red Rose Bush
Small Juniper
Tall Grass
Tall Grass Cluster
Weed Bush
Weeds 2
Weeds 3
Weeds 4
Weeds 5
Weeds 6
Wild Flowers Cluster
Wild Weeds Cluster
Citizens
ClothedWoman1
ClothedWoman2
ClothedWoman3
MaleWorker1
MaleWorker2
MaleWorker3
MaleWorker3
MaleWorker4
MaleWorker5
OldMan1
OldMan2
Nets
Field Network 0
Field Wheat Cut Network 3
Field Wheat Network 3
Field Wheat Young Network
Plastered Wall Network
Railyard Retaining Wall 03 EF
Railyard Retaining Wall 03 MA
Railyard Retaining Wall 03 MF
Railyard Retaining Wall 03 MI
Railyard Tunnel 03 T1
Stairsnetworkkl
Stone city wall - covered
Stone city wall - open
Terraforming Network Ext 0.5U
Terraforming Network Ext 12U
Terraforming Network Ext 1U
Terraforming Network Ext 2U
Terraforming Network Ext 4U
Terraforming Network Ext 6U
Terraforming Network Ext 8U
TinyCanal
TinyCanal - NoMassTransit


Loading stats
Performance
Custom assets loaded
270 assets
Loading speed
167.0 assets / second
Custom assets loading time
0:02 minutes:seconds
Total loading time
0:23 minutes:seconds
Peak memory usage
RAM
6.1 GB
Virtual memory
10.1 GB
Sharing of custom asset resources
Textures
347 times
Materials
180 times
Meshes
80 times
Skipped prefabs
Building prefabs
0
Vehicle prefabs
0
Prop prefabs
0

Sorry for the long delay - I just saw this. I wish Steam would not hide "discussions" behind their own tab! Anyhow, I do not know why LSM gave you such a long list of errors - I think it is related to the LSM breaking when they released airports.

Only these two assets from your first list are mine:

2785757158.1x1Romanlvl1lowresI_Data: Private building cannot include roads or other net types
2785757158.2v2Romanlvl2lowresCornerA_Data: LOD xys null

I think I can fix the 1x1 roman low resI (it must have a road or path included that needs removed) but I am not sure about lowresCornerA, I do not recognize that LOD error.

For the longer list you posted, I can see that the "romstall cloth" is a local asset and was not the version published to the WS. I can also fix this.

The rest, idk, they worked for me and work for others.