执行我创建的stored procedure时出现此错误
消息241，级别16，状态1，程序UDP初始客户尺寸人口，第28行
从字符串转换日期和/或时间时转换失败。
该过程的代码为：

CREATE PROCEDURE UDP_INITIAL_CUSTOMER_DIM_POPULATION
AS
BEGIN
    SET NOCOUNT ON

    EXEC UDP_REMOVE_NULLS_FROM_CUSTOMER_STG

    INSERT INTO dbo.customer_dim(customer_no, first_name, middle_name, last_name,
                                 street_number, street_name, po_address, zip_code, city,
                                 region, country)
        SELECT DISTINCT 
            CAST(customer_no AS VARCHAR),
            first_name,
            middle_name,
            last_name,
            street_number,
            street_name,
            po_address,
            zip_code,
            city,
            region,
            country
        FROM 
            dbo.customer_stg

    PRINT 'Initial customer data in place!'
    SET NOCOUNT OFF
END

创建customer_dim表的代码为：

CREATE PROCEDURE dbo.UDP_CREATE_CUSTOMER_DIM
AS
BEGIN
    IF OBJECT_ID('customer_dim', 'U') IS NOT NULL
    BEGIN
        DROP TABLE customer_dim
    END

    CREATE TABLE [dbo].[customer_dim]
    (
        [customer_sk] INT IDENTITY (1,1) PRIMARY KEY,
        [customer_no] [varchar](50) NULL,
        [first_name] [varchar](50) NULL,
        [middle_name] [varchar](50) NULL,
        [last_name] [varchar](50) NULL,
        [customer_name] [varchar](50) NULL,
        [street_number] [varchar](50) NULL,
        [street_name] [varchar](50) NULL,
        [customer_address] [varchar](100) NULL,
        [po_address] [varchar](50) NULL,
        [zip_code] [varchar](50) NULL,
        [city] [varchar](50) NULL,
        [region] [varchar](50) NULL,
        [country] [varchar](50) NULL,
        [effective_date] DATE NULL DEFAULT GETDATE(),
        [expiry_date] DATE NULL DEFAULT '999-12-31'
    ) ON [PRIMARY]
    END

我试着寻找一个解决方案，但因为我不想在日期或时间做任何事情，我找不到任何对我有意义的事情。