"...has incorrectly formatted target version "Unknown"."?

[Bludragon]

"...For the current version, write: <targetVersion>0.15.1284</targetVersion>"

I have a whole slew of these in my debug window for:

Animal Feed Trough V1.1 A15
Mod Barn Stall V1.0 A15
Boomrat launcherA9(this one might be out of date)
Cobblestone Floors A15
DeepCoreMiner
DeepCoreMiner-GlitterTechAddon
DeepCoreMiner-StoneAddon
Electric Wall Torch Mod V1.0 A15
Fireplace Mod V1.7 A15
Mamuffalo V1.02 A15
More Vanilla Turrets1.7.5A15
PackMuffalo
Rikiki's Miscellaneous
RWAutoSell_v1118_A15c
TimerSwitches_3
TradingSpot.1.0.6
Turrets+
Wall Torch Mod V1.1 A15

I just installed the game on my work computer and DL'd these mods to pick and choose from. Not all that I DL'd are giving this message. I tried putting the suggested <targetVersion>0.15.1284</targetVersion> into the "Building_AnimalFeedTrough"dotxml document in the defs/ThingDefs folder of the animal feed trough mod but that didn't work. So.... now what?

[harpo99999]

the version line goes into the about.xml  in the about folder for the mod, then the mod(s) should not give that error

[Bludragon]

lol no wonder it didn't work, wrong file!

Thanx!

why on earth are these doing this all of a sudden though? I pretty much have all the same ones on my comp at home and this didn't happen there.

was there a change in the game itself, perhaps?

Edit: ok so i got the right file this time, but it has the right target version in it already:
<?xml version="1.0" encoding="utf-8"?>
<ModMetaData>
  <name>Animal Feed Trough V1.1</name>
  <author>BaconBits</author>
  <targetVersion>0.15.1284</targetVersion>
  <description>An feed trough to store hay, kibble for animal use.</description>
</ModMetaData>

[harpo99999]

the mod structure should be {mod name}(folder) containing folders {about}{defs}...
if the folder structure is {mod archive name}{mod name}{about}..., then you will get the error, the quick fix is to move the {mod name} folder(and contents) up to the {mods} folder then delete the {mod archive name} folder

[Bludragon]

ok that appears to be the problem, not sure how it got like that but i can fix it! 

[Tammabanana]

ok that appears to be the problem, not sure how it got like that but i can fix it! 

Sometimes it happens because of the way a mod was zipped up, I think.

[Bludragon]

could be...
I unzipped them all the same way

[Tammabanana]

could be...
I unzipped them all the same way

It's the original zipping up that does it. Sometimes the zip itself has the extra layer.