HTTP Error 500.19 - Internal Server Error when accessing website

I have just uploaded an ASP.NET Core 2.1 app. I get this error when I try to run my website on IIS 8.0

Detailed Error Information:

Module IIS Web Core

Notification BeginRequest

Handler Not yet determined

Error Code 0x8007052e

Config Error Can not log on locally to C:\Inetpub\vhosts\website-domain.my\dev.website-domain.my\MSS as user username with virtual directory password

Config File

\?\C:\inetpub\temp\apppools\dev.website-domain.my(domain)(4.0)(pool)\dev.website-domain.my(domain)(4.0)(pool).config

Requested URL http://dev.website-domain.my:80/MSS/

Physical Path

C:\Inetpub\vhosts\website-domain.my\dev.website-domain.my\MSS\

Logon Method Not yet determined
Logon User Not yet determined

Config Source:

<application path="/MSS" applicationPool="dev.website-domain.my(domain)(4.0)(pool)">  
      <virtualDirectory path="/" physicalPath="C:\Inetpub\vhosts\website-domain.my\dev.website-domain.my\MSS" userName="username" password="[enc:AesProvider:4+kg/83a+hodVa/zMgLvRNQjrQjQp82oK77jfYDH0ak=:enc]" />           
</application>

I have given full access control to my username user on the MSS folder but i still get this error. My application pool is showing the username user in the Identity column as well. What else am I missing? Could this be a .net core issue also?