Splunk add-on Builder blank page?

[norbertt911]

Hello,

The Splunk add-on builder won't load, it has the header, but the rest is blank. (9.0.3 enterprise + 4.1.1 app)

- Reinstall not helps

-Nothing in splunkd.log, add-on builder logs

- I found this event in web_service.log, but I don't know what should I do with it:

File "/opt/splunk/etc/apps/splunk_app_addon-builder/bin/splunk_app_add_on_builder/solnlib/utils.py", line 169, in extract_http_scheme_host_port
raise ValueError(http_url + " is not in http(s)://hostname:port format")
ValueError: splunk."mydomain"."ext" is not in http(s)://hostname:port format

note: I changed the real hostname.

Everything else is ok, all other apps are works fine. I reach the server on  https://splunk."mydomain"."ext":8000  . splunk."mydomain"."ext" format set in server. conf as serverName and in web. conf for mgmtHostPort (with :"port")

Any ideas?

Thanks in advance,

[triptraptresko]

Hey!
I had the same issue.
If you look in

index=_internal log_level IN ("error", "warn") splunk_app_addon-builder

You'll find

/opt/splunk/etc/apps/splunk_app_addon-builder/appserver/controllers/app_validation.py cannot be executed by Python: cannot import name 'soft_unicode' from 'markupsafe' (/opt/splunk/lib/python3.7/site-packages/markupsafe/__init__.py)

Seems the python package markupsafe removed 'soft_unicode' , starting from versions later than 2.0.0.

Solution is to use pip to downgrade

pip3 install --target=/opt/splunk/lib/python3.7/site-packages markupsafe==2.0.0 --force --upgrade

Then restart splunk.
As I'm sure you're aware, this is absolutely a hack...

Happy app-building 🙂