Hi @Kaveya S ,
(1) You need to check SSIS Project ProtectionLevel setting value.
It is recommended to set it as DontSaveSensitive.
It may ask you to set the same ProtectionLevel value for each SSIS package in the project.
(2) Please ensure that you are using SQL Server Integration Services Projects extension for VS2019 v3.16, and ignore v.4. versions.
(3) If you are using SSIS Script Task, please check that VS2019 .Net Framework version is installed on the SSIS run-time server.
(4) Please ensure that SSIS project TargetServerVersion is matching SSIS run-time version on the server.