Ah, I'll use the browser to preview the WEB APP temporarily

I Try to add { "qt_version": "5.12", } to clickable.json

Recompile successfully

Clickable desktop mode runs successfully

apanda@ubuntu:~$ cd ~/myapp && clickable desktop
......
qml: Start browsing
QDir::mkpath: Empty or null file name
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Morph/Web/MorphWebView.qml:139:9: Unable to assign [undefined] to QObject*
qml: Loaded 19 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Morph/Web/ua-overrides-desktop.js
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Morph/Web/MorphWebContext.qml:102: Error: Invalid write to global property "userAgentOverrides"
[PERFORMANCE]: Last frame took 81 ms to render.

But push to device failed

apanda@ubuntu:~$ clickable --ssh Nexus6P
......
Successfully built package in './myapp.apanda_1.0.0_all.click'.
/home/apanda/myapp/build/all/app/myapp.apanda_1.0.0_all.click: pass
......
......
/home/phablet/myapp.apanda_1.0.0_all.click failed to install.
**WARNING:root:Signature check failed, but installing anyway as requested
Cannot install /home/phablet/myapp.apanda_1.0.0_all.click: Framework "ubuntu-sdk-16.04.5" not present on system (use --force-missing-framework option to override)

Command exited with non-zero exit status 7, see above for details. This is most likely not a problem with Clickable.**

I tried to copy 'myapp.myname_1.0.0_all.click' to the device and installed it myself but it failed
I had to set to the default value 'Qt 5.9' before Compile and push to device

How can i fix it

Select Template:
1 - QML Only
2 - C++
3 - Python
4 - HTML
5 - Go
6 - Rust
Choose from 1, 2, 3, 4, 5, 6 [1]: 4

apanda@ubuntu:~/myapp$ clickable build
Copied files to install directory for click building
Successfully built package in './myapp.yourname_1.0.0_all.click'.
/home/apanda/myapp/build/all/app/myapp.yourname_1.0.0_all.click: pass

apanda@ubuntu:~/myapp$ clickable desktop
Copied files to install directory for click building
Successfully built package in './myapp.yourname_1.0.0_all.click'.
/home/apanda/myapp/build/all/app/myapp.yourname_1.0.0_all.click: pass
non-network local connections being added to access control list
Mounting device home to /home/apanda/.clickable/home
bash: webapp-container: command not found
Command exited with non-zero exit status 127, see above for details. This is most likely not a problem with Clickable.

But the Python APP runs successfully

Select Template:
1 - QML Only
2 - C++
3 - Python
4 - HTML
5 - Go
6 - Rust
Choose from 1, 2, 3, 4, 5, 6 [1]: 3

apanda@ubuntu:~/pyapp$ clickable desktop
-- The C compiler identification is GNU 5.4.0
......
......
Successfully built package in './pyapp.yourname_1.0.0_all.click'.
/home/apanda/pyapp/build/all/app/pyapp.yourname_1.0.0_all.click: pass
non-network local connections being added to access control list
Mounting device home to /home/apanda/.clickable/home
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-apanda'
libGL error: failed to open drm device: Permission denied
libGL error: failed to load driver: vmwgfx
"/home/apanda/pyapp/build/all/app/install/%U" does not exist.
Got library name: "/usr/lib/x86_64-linux-gnu/qt5/qml/io/thp/pyotherside/libpyothersideplugin.so"
qml: module imported
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/1.3/Icon.qml:115:5: QML Image: Failed to get image from provider: image://theme/chevron
file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/1.3/Icon.qml:115:5: QML Image: Failed to get image from provider: image://theme/chevron
qml: example.speak returned Hello World!