Error! An error occurred: 'NoneType' object has no attribute 'convert'

[Alex-451]

Trying to make a plugin and I keep getting the error: Error! An error occurred: 'NoneType' object has no attribute 'convert'
I have chromium installed and I can manually take screenshots of websites using the cli tool. Does anyone know what I am doing wrong?

11:13:51 - INFO - refresh_task - Manual update requested
11:13:51 - ERROR - utils.image_utils - Failed to take screenshot: [Errno 2] No such file or directory: 'chromium-headless-shell'
11:13:51 - ERROR - refresh_task - Exception during refresh
Traceback (most recent call last):
  File "/home/user/Git-projects/InkyPi/src/refresh_task.py", line 115, in _run
    image_hash = compute_image_hash(image)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/Git-projects/InkyPi/src/utils/image_utils.py", line 81, in compute_image_hash
    image = image.convert("RGB")
            ^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'convert'
11:13:51 - ERROR - blueprints.plugin - Error in update_now: 'NoneType' object has no attribute 'convert'
Traceback (most recent call last):
  File "/home/user/Git-projects/InkyPi/src/blueprints/plugin.py", line 164, in update_now
    refresh_task.manual_update(ManualRefresh(plugin_id, plugin_settings))
  File "/home/user/Git-projects/InkyPi/src/refresh_task.py", line 148, in manual_update
    raise self.refresh_result.get("exception")
  File "/home/user/Git-projects/InkyPi/src/refresh_task.py", line 115, in _run
    image_hash = compute_image_hash(image)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/Git-projects/InkyPi/src/utils/image_utils.py", line 81, in compute_image_hash
    image = image.convert("RGB")
            ^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'convert'

my tchibot.py:

...
from plugins.base_plugin.base_plugin import BasePlugin
from utils.app_utils import resolve_path, get_font
...
class Tchibot(BasePlugin):

    def generate_image(self, settings, device_config):
        try:
            image_template_params = {
                "plugin_settings": settings
            }

            dimensions = device_config.get_resolution()
            if device_config.get_config("orientation") == "vertical":
                dimensions = dimensions[::-1]

            image = self.render_image(dimensions, "tchibot.html", "tchibot.css", image_template_params)
        except Exception as e:
            logger.error(f"Failed to draw TchiBot: {str(e)}")
            raise RuntimeError("Failed to take screenshot, please check logs.")
        return image

{
    "display_name": "Tchibot",
    "id": "tchibot",
    "class": "Tchibot"
}

[fatihak]

I'm guessing this is occurring during local development?
That error usually means the take_screenshot function (in src/utils/image_utils.py) couldn’t run properly and returned None. You’ll need to install the chromium-headless-shell binary which is different than the regular Chromium browser. Or you can try updating the function to the command you use manually.

[phattmatt]

If you using the local development option, and are on Windows, you can try the process I wrote here:

#340 (comment)