Good evening, I am recently working on a basic MSI project. It consists of 3 features, one with x64 ReleaseFlags, one with x86 ReleaseFlags and the last one without ReleaseFlags as these are common libraries. In the main Template Summary field I set "; 0", I created 2 release configurations, one with "X86Flags" on Product Configuration Flags and Template Summary Field overrides to "Intel; 0" and the other with "X64Flags" and Template Summary Field overrides to "x64; 0" ". If I build the version configuration and run the installation, a custom action got an error saying "Error 1720. Script error -2146828275, Microsoft VBScript Run-Time Error: Type Mismatch: 'Session.Property', but if I remove x64 features, x64 release configuration and set Template Summary Property to "Intel;0" the installation was successfully.