Problem with CLIENT sided class

I am currently trying to get previously SP mod to work in MP and I getting this error report:

http://pastebin.com/q8TZBB3x

Here is my main mod class:

http://pastebin.com/0v6wd56V

The error happens when I am trying to construct my block:

tinyblock = new BlockTinyblock(tinyblocksDefaultID);

Here is that block class:

http://pastebin.com/qZG5vF4J

As can be seen from the code, I don't reference said EntityClientPlayerMP at any point.

What is wrong with my code? And how can I fix it?

Sorry about messy code... As I said I am in midst of lot of restructuring and simplifying code.