Custom Tool is no longer working in VS 2015

I got a new laptop with Windows 10 and VS 2015. Our application uses Reverse POCO Generator. We used to be able to right click on the SiriusSQL.tt file, select 'Run Custom Tool' and it worked fine. Now I am getting these errors (see the image).

So, what can I do with these errors? Also, the App.Config file has the following:

<?xmlversion="1.0"encoding="utf-8"?>

<configuration>

<startup>

<supportedRuntimeversion="v4.0"sku=".NETFramework,Version=v4.5"/>

</startup>

<connectionStringsconfigSource="db.config"></connectionStrings>

</configuration>

while db.config has that connectionString, e.g.

<?xml version="1.0"?><connectionStrings><!-- Dear Developer ... Tweak this connection string as you see fit, and please EXCLUDE it from any checkins. Thanks! --><remove name="Siriusware"/><add name="Siriusware"
           connectionString="Data Source=.;Initial Catalog=SiriusSQL_SysManager;Integrated Security=True"
           providerName="System.Data.SqlClient"/></connectionStrings>

Do you see what may be the problem and how to correct?

Thanks in advance.

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