An error occurred in "Install SharePoint application": the solution is not loaded next to the application enabled on this website.

During the development of the SharePoint 2013 app, the system prompts "loading the app next to this website is not enabled" during deployment ",

Error 1: An error occurred in the deployment step "Install SharePoint application": application loading is not enabled on this website.
0 01_pointapp1
"Sideloading of apps is not enabled on this site"

Solution:
1. Download http://www.microsoft.com/en-us/download/details.aspx? Id = 30359
2. Save the following steps as luozhuang. PS1
3. Run powershell
4. Runtime
Enter your SharePoint site URL
Enter the user name in the Microsoft account
Enter the Microsoft account password
Restart the computer and run vs2012 OK.

#CODE STARTS HERE$programFiles = [environment]::getfolderpath("programfiles")add-type -Path $programFiles'\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.dll'Write-Host 'To enable SharePoint app sideLoading, enter Site Url, username and password'   $siteurl = Read-Host 'Site Url'   $username = Read-Host "User Name"   $password = Read-Host -AsSecureString 'Password'   if ($siteurl -eq '') {     $siteurl = 'https://mytenant.sharepoint.com/sites/mysite'       $username = 'me@mytenant.onmicrosoft.com'       $password = ConvertTo-SecureString -String 'mypassword!' -AsPlainText -Force   }      $outfilepath = $siteurl -replace ':', '_' -replace '/', '_'   try {     [Microsoft.SharePoint.Client.ClientContext]$cc = New-Object Microsoft.SharePoint.Client.ClientContext($siteurl)       [Microsoft.SharePoint.Client.SharePointOnlineCredentials]$spocreds = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($username, $password)       $cc.Credentials = $spocreds           Write-Host -ForegroundColor Yellow 'SideLoading feature is not enabled on the site:' $siteurl            $site = $cc.Site;               $sideLoadingGuid = new-object System.Guid "AE3A1339-61F5-4f8f-81A7-ABD2DA956A7D"               $site.Features.Add($sideLoadingGuid, $false, [Microsoft.SharePoint.Client.FeatureDefinitionScope]::None);               $cc.ExecuteQuery();               Write-Host -ForegroundColor Green 'SideLoading feature enabled on site' $siteurl     #Activate the Developer Site feature }   catch   {      Write-Host -ForegroundColor Red 'Error encountered when trying to enable SideLoading feature' $siteurl, ':' $Error[0].ToString(); }#CODE ENDS HERE