Apparent my BL blew up.

[Clear]

I went to host a game and this popped up when I got to the objects loading Bar.

Fatal IVS:

Error reading PNG file:
incorrect data check

I tried to join a game and the same thing popped up.
I honestly have never seen this before, it seems to be a graphical error, it said something along the lines of Bitmap PNG file, which is confusing.

I want to know what I can do to make sure I can get back to playing.

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[Badspot]

A texture file was corrupted.  Re-install I guess.  I believe you can re-install over top of your current installation and not lose any of your settings or add-ons.  If it still doesn't work, then one of your add-on textures was corrupted and you'll probably have to delete the Blockland folder and reinstall from scratch. 

[Clear]

Seems to have worked fine, thanks.  <3