Alright, here's what is wrong: In the object called "damageblock", there is a collision event, where you have executed a code. In that code, you have used the wrong syntax, and for that, game maker can't run the code. In the script, please count the amount of open brackets "(", and the amount of closed brackets ")". If there is not the same amount of each, they should, for the syntax to be correct. Do the same with the squigly brackets "{" and "}", if there is not the same amount of each, then you should also fix that.
That fixed the first and the third error you mentioned. Now, for the second and the fourth error, we will need to see the code, that is in the collision event in the object called "damageblock". Can you take a snapshot of the executed code, in that specific location, and post it.