Most probably the problem in your case is caused by the name of the stylesheet that is specified in the configuration file. Note that you refer to the file as style1.css
and then in the ListTools
file the following path is used:
Please change the name of the stylesheet or the reference in the configuration file so that they match and the problem should be resolved.
You could also ensure that the installed version of RadEditor for SharePoint is the same as the one in the folder's name (you can find it marked above).
If the problem persists, please follow these steps for inserting the custom CSS file:
1. Create a CSS file with the desired style rules;
2. Open the file ListToolsFile.xml;
3. Add the cssFiles
inner tag in the file;
4. Include the item
inner tag in cssFiles
and set the name property with the path to your stylesheet, similarly to the example in the previously linked help article.
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