@roar Is there any way to fix it? I have gone to where the variables are and only this appears. Thank you!

Hello, when I compiled the project on the web to .mq4 there was no problem, I put it in metatrader 4 and when I used the strategy tester when starting directly I got this error;

I have gone to the line of code and the error is here;

Why is this happening? Thanks a lot!