After upgrading from SQL 2016 to SQL 2019 and upgrading SSIS+ from 1.8 to 2.0 I opened the package in VS2019 and received the following error message.
''Cannot create a task from XML for task, type SSIS.ReplacementTask due to error "The parameter is incorrect.""
In this particular case the customer unchecked the SQL 2016 module during the installation of SSIS+ version 2.0 and only allowed the SQL 2019 module to be installed. You should leave all default modules in place during the installation.