RoboHelp 2020 Output Microsoft HTML Help (.chm) ERROR

I would look for madcap javascript files in your assets/js folder and delete them. You might need to have a look at your topic code and do some cleanup as well, but I haven't done a conversion from Flare to RH so couldn't say for sure if or what that might be.

It's been a long time since I used chm but I think the breadcrumbs are defined in the master page header section. Have you checked the placeholder is there after the conversion (user the Edit Header button to ensure you're in the right area)? If they are perhaps try deleting and re-adding.

I imagine source control broke because the conversion from Classic to New UI creates a whole new path and file structure for the project, but I'm not using source control or New UI so am not certain. I'm not sure what the recommendations are for this scenario. I would recommend contacting supporting using the email address at the following address as it goes to a dedicated RH team. 
https://helpx.adobe.com/contact/enterprise-support.other.html#robohelp

Sorry I don't know what VSTS is or what impact it has on your project. The fact that the sample generates fine means that something is messed up in your project. The reference in the screenshot error talks about some MadCapUtilities.js file - was this project a conversion from Flare at some point?

The sample project creates the CHM just fine.Of course, that is not synced with VSTS, so I can't test that scenario.

For my converted 2019 project, I edited the Microsoft HTML Help preset General, Content, and Layout settings with the required items.

• General: Title, Output Path, CHM File, Language. I left Post Generation Script null because I don't know anything about those.
• Content: TOC, Default Topic, Index, Glossary, Condition Expression. Variable Set is null
• Layout: Master Page, Default Window

Thank you. Marla

Did you set up new presets in RH2020 or are you just using whatever came from RH2019? Are you having the same issue with the sample project?