Having trouble migrating an old mobile project to Response Web Desktop ("defaultTheme does not exist")

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There's an old project in Kony V7 that I didn't make, but I am trying to migrate it to Responsive Web Desktop.

I have taken these steps:

Imported the old project into Kony V8SP2

Allowed it to be automatically converted to a V8SP2 project

Confirmed that the mobile build still works

Went to project settings, enabled Responsive Web

Added a new blank form to the Responsive Web Desktop channel

Build

The build fails. This occurs near the end of the console output:

[echo] New structure ------------

[echo] themenames defaultTheme

The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:450: The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:453: C:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\jsoutput\\desktopweb\\defaultTheme does not exist.

Ant build error=The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:450: The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:453: C:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\jsoutput\\desktopweb\\defaultTheme does not exist.

The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:450: The following error occurred while executing this line:\nC:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\build\\desktopweb\\build.xml:453: C:\\Users\\jlison\\KonyVizEWS\\temp\\openblock\\jsoutput\\desktopweb\\defaultTheme does not exist.

Package Generation failed for platform .

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@Hevthew Powell​ , any assistance here?

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I found a solution, by means of comparing this converted project file structure to a new one.

This line must be in projectprop.xml:

<attributes name="studiovizproject" value="true"/>

I don't understand what it does, and I don't know where the corresponding option in the settings menu is. But it wasn't in the converted project, and when I added it, the converted project built correctly.

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Thanks @Ayv Sevws​ for sharing your solution. I'll try to get someone from our team to add more insight.