“Error requesting http://xp0.sc/sitecore/admin/PopulateManagedSchema.aspx?indexes=all”

Stuck on the very last step on installation! This one was the worst of all. Too many things that could be wrong. I had to look at too many things to resolve this one

[------------------------------------------------------------------------- UpdateSolrSchema : SitecoreUrl ------------------------------------------------------------------------------]
[UpdateSolrSchema]:[Authenticating] xp0.sc/.../PopulateManagedSchema.aspx
Install-SitecoreConfiguration : Error requesting xp0.sc/.../PopulateManagedSchema.aspx The remote server returned an error: (500) Internal Server Error.
At [path to install file]\install.ps1:68 char:1
+ Install-SitecoreConfiguration @sitecoreParams
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException
+ FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Install-SitecoreConfiguration

[TIME] 00:03:11
Transcript stopped, output file is [output file path]
Invoke-SitecoreUrlTask : Error requesting xp0.sc/.../PopulateManagedSchema.aspx The remote server returned an error: (500) Internal Server Error.
At C:\Program Files\WindowsPowerShell\Modules\SitecoreInstallFramework\1.2.0\Public\Install-SitecoreConfiguration.ps1:253 char:21
+ & $entry.Task.Command @paramSet | Out-Default
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException

Solution

The issue with my installation was that some of the versions of .Net Framework were not installed. As suggested in Sitecore Community, the issue was resolved after I manually installed/enabled ASP, ASP.NET 3.5, ASP .NET 4.7 from Windows Add/Remove Features

Source: Sitecore Community

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