Error running script from Script editor

[qgib]

Author Name: Albert van de Maat (Albert van de Maat)
Original Redmine Issue: 18250
Affected QGIS version: 3.0.0
Redmine category:processing/core

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Running a Python script from the Script editor throws an error:
"No script found - Seems there is no valid script in the file".
See attached png.

In this little script i just print a string to the Python Console, like:
print ("hello")
The string is logged to the console, but after that this error occurs.

Additional info:
After saving the script to the default script folder, 'Scripts' is disappeared from the Processing Toolbox
Also when Qgis is restarted this script is not loaded in the Processing Toolbox

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• Error_No_script_found.PNG (Albert van de Maat)

[qgib]

Author Name: Salvatore Larosa (@slarosa)

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Script framework has changed since 3.0. Now it uses the same syntax like algorithms.
Each script must be created subclassing the "@QgsProcessingAlgorithm@":http://python.qgis.org/api/core/Processing/QgsProcessingAlgorithm.html?highlight=qgsprocessi#module-QgsProcessingAlgorithm class.

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• status_id was changed from Open to Closed
• category_id was changed from PyQGIS Console to Unknown

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• resolution was changed from to invalid
• category_id was changed from Unknown to Processing/Core

[qgib]

Author Name: Lance Evans (Lance Evans)

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I'm also experiencing this issue. Whether I add a preexisting QgsProcessingAlgorithm class script or copying contents into a "New" script, nothing happens, no feedback, and no new script showing up in the Processing Toolbox. Also, Scripts icon disappears as Albert indicated.