The INSERT statement conflicted with the FOREIGN KEY

CREATE DATABASE Workshop;
USE Workshop;

CREATE TABLE Confectionery (
ID INT IDENTITY NOT NULL PRIMARY KEY,
NameProduct NVARCHAR(50) NOT NULL,
Category INT NOT NULL,
Quantity SMALLINT NOT NULL,
Price DECIMAL(20)
);

CREATE TABLE ConfectioneryCategory (
ID INT IDENTITY NOT NULL PRIMARY KEY,
CategoryName NVARCHAR(50) NOT NULL,
);

CREATE TABLE Sales (
SaleID INT IDENTITY NOT NULL,
Quantity INT NOT NULL,
DateOfSale DATE,
IDPastryChef INT NOT NULL,
IDProduct INT NOT NULL,
PRIMARY KEY(SaleID, IDProduct )
);

CREATE TABLE PastryChef (
ID INT IDENTITY NOT NULL PRIMARY KEY,
FirstName NVARCHAR(50),
LastName NVARCHAR(50),
ManifacturedProduct NVARCHAR(50)
);

ALTER TABLE Sales
ADD CONSTRAINT FK_Confectionery_Sales FOREIGN KEY (IDProduct)
REFERENCES Confectionery (ID)
ON DELETE CASCADE
ON UPDATE CASCADE
;

ALTER TABLE Confectionery
ADD CONSTRAINT FK_Confectionery_ConfectioneryCategory FOREIGN KEY (Category)
REFERENCES ConfectioneryCategory (ID)
ON DELETE CASCADE
ON UPDATE CASCADE
;

ALTER TABLE Sales
ADD CONSTRAINT FK_Sales_PastryChef FOREIGN KEY (IDPastryChef)
REFERENCES PastryChef (ID)
ON DELETE CASCADE
ON UPDATE CASCADE
;

INSERT INTO Confectionery(NameProduct,Category,Quantity,Price )
VALUES('Donuts', 1, 50,'0.99');