I contacted the brokerage ModalMais, they informed me that I should always use the following to make it work:

trade.SetTypeFilling (ORDER_FILLING_RETURN);

As I do not understand much of programming, it did not help me much, so that's the question now, how to fix the code if I'm not a programmer, if you can help I'll be very grateful.
@fxDreema

Fxdreema, Any solution? I still continue with the error, my EA is working on the demo account, but when I try to use the actual account it continues with this error. Modal brokerage, but you have to be a customer to clear your account. EA executions are on the market, there are no pending orders.
. I hope I have some solution, thank you.

I am trying to create a simple script that sends a pending order, I had already done something like a short time and it worked but now it is returning this error, can anyone help me?

Hello, I solved my problem by deleting some lines of the code, the ones that are selected, as I show in the image. Leave only the one that is circled.

Hello, future business in Brazil, "Modal" brokerage, I created an EA that worked normally in several brokerages, I use the same mt5, I change only the login to change account, but this is giving error "OrderCheck () failed: Unsupported filling mode (10030) ", I saw that some people have this problem but can not find a solution, could you help me? Thank you.