Getting an error when working with Responsive Design Output: MasterThemeSchema.xml

[nancy2019]

When generating a Responsive Design HTML 5 output, I'm getting this error:  "MasterThemeSchema.xml file has invalid data." I am unable to  access the manage layout features now to continue my customizations.  I had imported a customized font before seeing this message. I'm moved the project to my harddrive, where the software is installed, and and still getting it (I know RH doesn't always do well on a network drive).  Any ideas?

[nancy2019]

I searched this blog for similar posts and found posts that described similar issues.  I ended up moving my RH project file to my local drive, deleting the masterthemeschema.xml, and replacing it with another masterthemeschema.xml from another project via Windows Explorer.  I will recreate my customizations and hope for the best.  Any ideas on what causes this corruption of the mastertheme schema files in the first place?  Does this masterthemeschema.xml error only occur when working on a network drive and not local?

[Willam_van_Weelden]

It's hard to tell the issue without having the XML file. Probably an invalid value is added somewhere. If you have the invalid XML, I can take a look.