[Release](Newbee-Friendly)Modding Guide Assembly-CSharp.dll

I keep getting error at CoCreateInstance code 0x80131700 Do you want to load the file I say yes then it says the file doesn't contain any instructions or data,I.e nothing to disassemble.. How do I fix?
 
Really informative guide, im on phone and its a pain in the ass reading it, ill look more into it later, but looks promising, thanks!