Copy & Paste MLQ4 Language Editor

Koning Willem  

I typed code in a text file now I want to put it into a file in the MLQ4 Language Editor, but when I copy it it only paste an error that I earlier copied. it wil only let me copy and paste from the inside of the program. if I trie to paste my code it just acts like it was never copied. 

I hope someone out here has an easy solution because this is a **** in the ***.