Err what the hell?
I've never seen anything like this before.
Well it seems like a pet walked over your keyboard there.
The shape it tries to load is located at:
Blockland\base\data\shapes\player\m.dts
So go there and rename it to the proper extension.
If that doesn't work, reinstalling may be in order.
That wont work since the folder it is trying to load isn't a default directory.
It appears you might have to do one of these things
1). Move Cache.db out of your Blockland folder to see if that works.
If this works, delete the Cache.db to save space.
2). Rename Add-ons / Remove Add-ons
You might have an add-on causing this, try to remove or check recent add-ons.
3). Re-install.
But that's the strangest thing I've ever seen.
