My trigger doesnt work due to a problem related to the clause then

July 7, 2023

So i have a project where i have to build a database and establish connections between the tables and to create some views, procedures and triggers.
So i created one and i can´t seem to why it doesn´t work.
Here is the piece of code of the trigger:

CREATE TRIGGER TRG_ValidarEstoque
ON Trabalho.Equipamento
FOR INSERT 
AS
 BEGIN
    DECLARE @estoque_minimo INT;

-- Defina o valor do estoque mínimo aceitável
SET @estoque_minimo = 10;

-- Verifique se o estoque está abaixo do limite mínimo, se estiver aparece uma mensagem
IF NEW.Stock < @estoque_minimo THEN
    SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Estoque abaixo do limite mínimo';
END IF;
END;

And here’s the table i m using if it helps:

CREATE TABLE Trabalho.Equipamento (
Equipamento_ID INT PRIMARY KEY,
Designacao VARCHAR(99),
DataAquisicao DATE,
Stock INT,
Fornecedor_ID INT,
Colaborador_ID INT,
FOREIGN KEY (Colaborador_ID) REFERENCES 
Trabalho.Colaborador(Colaborador_ID),
FOREIGN KEY(Fornecedor_ID) REFERENCES 
Trabalho.Fornecedor(Fornecedor_ID)
);

I tried removing some pieces of the code and when i thought it would be working a new error would appear. I get the following error if it helps.