If you are making a site for app developing test….In this case normally we must create using development site. But sometimes we don’t know, so that deploy specific app project, it shows Error “Error occurred in deployment step ‘Install SharePoint Add-in‘: sideloading apps is not enabled on this site.
Solution : It needs to activate sideloading Features on the site.But I think it is able to activate on site collection features or site features, but no matter how I check that features on site settings, there are no features, so you must use powershell, please check this link : I am also using this powershell then I activated it
Key is below like that
$sideLoadingGuid = new-object System.Guid “AE3A1339-61F5-4f8f-81A7-ABD2DA956A7D”
$site.Features.Add($sideLoadingGuid, $true, [Microsoft.SharePoint.Client.FeatureDefinitionScope]::None);
Then if I deploy my app to sharepoint, it is successfully deployed , but then it has problem which I’ve created.