Scenario :

We are building a SSIS Package but receiving the “The Locale ID 9 is not installed on this system” error.  We are using the SQL server 2017 Enterprise Edition and Visual Studio 2015 Community Edition with SSDT 2015 Edition.

Solution :

Step 1:

Go to the Project Properties as shown below.

Step 2:

In the Configuration Properties check if the Target SQL version is set to correct version.

Step 3:

If still not working set the SQL Server to a lower version than your current version.