Unknown connection string. Name: '$(1)' – Sitecore 10.1 Unicorn Error If you are facing issue of “Unknown connection string. Name: '$(1)'” in Sitecore 10.1 then you can resolve this issue by changing in this config file “Unicorn.DataProvider.config”. <databases> <database id="master"> <dataProviders> <dataProvider ref="dataProviders/main"> <patch:attribute name="ref">dataProviders/unicorn</patch:attribute> </dataProvider> </dataProviders> </database> <database id="core"> <dataProviders> <dataProvider ref="dataProviders/main"> <patch:attribute name="ref">dataProviders/unicorn</patch:attribute> </dataProvider> </dataProviders> </database> </databases> With this <d