Error in Xcode (submission app)- IOS certificates and Provisioning profiles issue

Hello, I am quite new to the development comunity and I got an error that I need to fix. Basically I have developed a game in Unity 3d then exported the Xcode project file. I run the xcode and load the file, then I got 2 errors. I need to fix them till then I cannot build the game and publish it. The first error is about Code signing- about provisioning file... I have already created IOS provisioning profiles (Development and Distribution) + IOS certificate (Production and Development). I have even created APP ID + fill out everything in app submission. I just need to be able to build it in the xcode but it keeps telling me that it requires the provisioning profile- I have everything active, so why this error? The second error is about Code Signing too. In this case I have no idea what that means.. Something with “application” If you think you are capable enought to do it (to tell me what to do)= text me and I will send you a screenshot of the errors in Xcode. I will pay you just 8-10€ because it should be for experience developer an easy advice with no problem. PLEASE NOTE: I will pay you only if your help will actually solve the problem.