I have add a Web Part to my sharepoint 2013 site but I click on it in the Web Part Gallery, the site page return the following error
Can someone explain that and give me a solution?
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Looks like you have the custom webpart which you uploaded into the Site collections's web part gallery. I think you need to deploy and install that solution in order to use it.
Also check this post: Has anyone seen this error; $Resources:core,ImportErrorMessage;
When I created my SharePoint Project I did not select farm solution so i got the same Error Message when I tried to Add my WebPart to the Site.
to change it to farm solution change the project propertys:
Sandboxed Solution from true to false
Include Assembly In Package from false to true
Maybe this can help.
Did you add your Webpart an then got the Error Message or while you try to add it to the site?