The error message you are receiving suggests that there is a problem with the YJ K2 Image Slider module. There are a few potential reasons why you might be seeing this error message:
Compatibility issues: The module may not be compatible with the version of Joomla or K2 that you are using. Make sure that you are using the latest version of both Joomla and K2, and that the YJ K2 Image Slider module is also up-to-date.
Configuration issues: The error message may be related to incorrect configuration settings for the module. Double-check that you have configured the module correctly, including the image and article settings.
Conflicting extensions: There may be other extensions installed on your Joomla site that are conflicting with the YJ K2 Image Slider module. Try disabling other modules or plugins one at a time to see if the error goes away.
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If none of these solutions work, you may need to seek assistance from the developer of the YJ K2 Image Slider module.