Try removing the /wiki/ that's right after .org in $wmgWikibaseRepoUrl , you can do this via managewiki.
GO to Special:ManageWiki/settings, go to the Wikibase tab/section, then click on the $wmgWikibaseRepoUrl box, simply delete the /wiki/ and save. So you should be left with just **https://wikidata.org** there.

The reason nothing is working is because with the current url you added there, the system now loads https://wikidata.org/wiki//w/api.php?action=wbsearchentities instead of https://wikidata.org/w/api.php?action=wbsearchentities.

In fact, I just realised that what you have there is https://wikidata.org instead of https://widedata.org, they are both really identical.
So please put https://widedata.org (your own wiki URL) there not https://wikidata.org.

In T9920#200330, @Ugochimobi wrote:

In fact, I just realised that what you have there is https://wikidata.org instead of https://widedata.org, they are both really identical.
So please put https://widedata.org (your own wiki URL) there not https://wikidata.org.

Hi mate, thank you for your help :) I did what you said but it still didn't work. It's in your settings right now. Please don't hold back, I have to deal with this somehow.

You didn't do that, please change wikidata URL to your wiki's URL, specifically use this URL **https://widedata.org** instead.

In T9920#200444, @Ugochimobi wrote:

You didn't do that, please change wikidata URL to your wiki's URL, specifically use this URL **https://widedata.org** instead.

Aren't you talking about this? I did this and updated but still the same. Or I failed. Can you help me in detail?

Yeah, this is it but, what should be in Repository URL ($wmgWikibaseRepoUrl) should be https://widedata.org

In T9920#200447, @Ugochimobi wrote:

Yeah, this is it but, what should be in Repository URL ($wmgWikibaseRepoUrl) should be https://widedata.org

I did but it still didn't work :(

In T9920#200447, @Ugochimobi wrote:

Yeah, this is it but, what should be in Repository URL ($wmgWikibaseRepoUrl) should be https://widedata.org

I appreciate you my friend, thank you very much. It worked 💫🙏

Kindly clear your browser cache, as everything works fine from my end. Diff: https://widedata.org/w/index.php?title=Property:P13&oldid=77
Also, I noticed that you have Federated Properties enabled, please have it in mind that if you really want to use this feature then you should not ever disable it, like, it has to be enabled forever. Otherwise you'll face a lot of issues if you decide to disable it after using it already.

In T9920#200459, @Ugochimobi wrote:

Kindly clear your browser cache, as everything works fine from my end. Diff: https://widedata.org/w/index.php?title=Property:P13&oldid=77
Also, I noticed that you have Federated Properties enabled, please have it in mind that if you really want to use this feature then you should not ever disable it, like, it has to be enabled forever. Otherwise you'll face a lot of issues if you decide to disable it after using it already.

Got it, thank you very much. Finally, can I pull property and content from Wikidata? Is there a bot or any app for this?

That is totally unrelated to this task, but, if you want to use pull properties from wikidata then federated properties that you have enabled already are the best bet, but you should never disable it. You can also manually create the individual properties. Importing them to your wiki via XML is not advisable, I mean, I will personally not advise any user to do that, you will face a lot of issues.