Build error: ninja msgfmt: cannot locate ITS rules for gst-devtools/debug-viewer/po

I run meson, then run ninja. Ninja compiles most of the way then fails once it reaches debug-viewer. AFAIK the reason is something is wrong or missing about po or xml files. This is the following problem I am encountering. I guess I need something special for gettext?

[10/124] Generating org.freedesktop.GstDebugViewer.appdata.xml_subprojects@gst-devtools@debug-viewer_merge with a custom command.
FAILED: subprojects/gst-devtools/debug-viewer/org.freedesktop.GstDebugViewer.appdata.xml
"C:/Users/sefa/AppData/Roaming/Python/Python37/Scripts/meson" "--internal" "msgfmthelper" "../subprojects/gst-devtools/debug-viewer/org.freedesktop.GstDebugViewer.appdata.xml.in" "subprojects/gst-devtools/debug-viewer/org.freedesktop.GstDebugViewer.appdata.xml" "xml" "../subprojects/gst-devtools/debug-viewer/po"
msgfmt: cannot locate ITS rules for ../subprojects/gst-devtools/debug-viewer/org.freedesktop.GstDebugViewer.appdata.xml.in
[19/124] Compiling C object subprojects/gst-editing-services/ges/f71a697@@ges-1.0@sha/ges-audio-uri-source.c.obj.
ninja: build stopped: subcommand failed.

Here is the attached meson-log.txt.