The API keeps crashing when i try to start it

Do you have any errors in your error log here:
%appData%\StardewValley\ErrorLogs

yes

Could you post them here? :)

ok

[20:50:48] Critical error: System.IO.FileNotFoundException: Could not found: C:\Users\Ade\Downloads\Update\Stardew Valley.exe
vid StardewModdingAPI.Program.ConfigurePaths()
vid StardewModdingAPI.Program.Main(String[] args)
[20:50:48] The API will now terminate. Press any key to continue...

thats everything

Have you placed your StardewModdingAPI.exe next to your Stardew Valley.exe

does it have to be there?

Yeah :) It has to be next to your Stardew Valley.exe, so if you use Steam like C:/ProgramFiles/Steam/steamapps/common/StardewValley

what do you mean with next to?

it tells me that there is a missing method

Are you using Stardew 1.07?

i don't know how do you tell

i have 1.03

I think if you check the log again, it'll say near the top. For example, the top two lines in mine are:
[06:59:30.562 PM] SDV Version: 1.07
[06:59:30.562 PM] SMAPI Version: 0.40.0

You'll likely need to update to a later version of Stardew, let me know if it doesn't work on the latest version. :)