How to create external tables in Azure synapse

Question

Scenario-I have created views in Azure synapse. I have to create external tables in Azure synapse, but i am getting below error.

Error message-External table location path is not valid. Location provided: 'https://project01sadatalake.blob.core.windows.net/silver/extsales/'

Script;

CREATE MASTER KEY ENCRYPTION BY PASSWORD ='Sql@12345';

CREATE DATABASE SCOPED CREDENTIAL cred_project
with IDENTITY ='MANAGED IDENTITY';
-----------------
--External Data source
CREATE EXTERNAL DATA SOURCE source_silver1
with(
    LOCATION='https://project01sadatalake.blob.core.windows.net/silver',
    CREDENTIAL = cred_project
)

CREATE EXTERNAL DATA SOURCE source_gold1
with(
    LOCATION='https://project01sadatalake.blob.core.windows.net/gold',
    CREDENTIAL = cred_project
);
-------------------------

CREATE EXTERNAL FILE FORMAT format_parquet
with(
    FORMAT_TYPE=PARQUET,
    DATA_COMPRESSION='org.apache.hadoop.io.compress.SnappyCodec'
)


create EXTERNAL table gold.extsales
with(
    LOCATION= 'extsales',
    DATA_SOURCE=source_gold1,
    FILE_FORMAT=format_parquet
)
AS
SELECT * FROM gold.sales;