ReSharper error: Unable to convert instance argument type 'System.Security.Principal.IPrincipal

In a .net core class project I have implemented IClaimsService

from IdentityServer4.Services

. I have the following code in this class

protected virtual IEnumerable<Claim> GetStandardSubjectClaims(IPrincipal subject)
{
    var claims = new List<Claim>
    {
        new Claim(JwtClaimTypes.Subject, subject.GetSubjectId()),
        new Claim(JwtClaimTypes.AuthenticationTime, subject.GetAuthenticationTimeEpoch().ToString(), ClaimValueTypes.Integer),
        new Claim(JwtClaimTypes.IdentityProvider, subject.GetIdentityProvider()),
    };

    claims.AddRange(subject.GetAuthenticationMethods());

    return claims;
}

      

        
        
        
      

    

In the above code, the subject is marked in red and the error looks like this

Cannot convert instance argument type 'System.Security.Principal.IPrincipal [System.Security.Principal, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a]' to 'System.Security.Principal.IPrincipal [System.Private.CoreLib , Version = 4.0.0.0, Culture = neutral, PublicKeyToken = 7cec85d7bea7798e] '

Only, ReSarper shows this as a bug, not sure what to do to fix it. And this error stops showing other warnings, after filtering ReSharper shows other warnings