But that is commented.. So it shouldn't affect it.. right?
Oh, excuse me, you're right, there are so many line comments I didn't notice the block comment.
I guess your problem are coming from your strange way to set comments:
//---------\\
TinyWireS.begin(I2C_SLAVE_ADDRESS);
The last backslash makes the newline part of the line so it adds the whole next line to the comment and TinyWireS.begin() never gets called.