Unhandled Runtime Error
Error: FUSIONAUTH_ISSUERmissing in environment variables.
 
  10 | const missingError = 'missing in environment variables.';
  11 | if (!fusionAuthIssuer) {
> 12 | throw Error('FUSIONAUTH_ISSUER' + missingError)
     |      ^
  13 | }
  14 | if (!fusionAuthClientId) {
  15 | throw Error('FUSIONAUTH_CLIENT_ID' + missingError)

I have these code from the guide in my [..nextauth].js file:

import NextAuth from "next-auth"
import FusionAuthProvider from "next-auth/providers/fusionauth"

const fusionAuthIssuer = process.env.FUSIONAUTH_ISSUER;
const fusionAuthClientId = process.env.FUSIONAUTH_CLIENT_ID;
const fusionAuthClientSecret = process.env.FUSIONAUTH_CLIENT_SECRET;
const fusionAuthUrl = process.env.FUSIONAUTH_URL;
const fusionAuthTenantId = process.env.FUSIONAUTH_TENANT_ID;

const missingError = 'missing in environment variables.';
if (!fusionAuthIssuer) {
    throw Error('FUSIONAUTH_ISSUER' + missingError)
}
if (!fusionAuthClientId) {
    throw Error('FUSIONAUTH_CLIENT_ID' + missingError)
}
if (!fusionAuthClientSecret) {
    throw Error('FUSIONAUTH_CLIENT_SECRET' + missingError)
}
if (!fusionAuthUrl) {
    throw Error('FUSIONAUTH_URL' + missingError)
}
if (!fusionAuthTenantId) {
    throw Error('FUSIONAUTH_TENANT_ID' + missingError)
}

export const authOptions =
{
    providers: [
        FusionAuthProvider({
            issuer: fusionAuthIssuer,
            clientId: fusionAuthClientId,
            clientSecret: fusionAuthClientSecret,
            wellKnown: `${fusionAuthUrl}/.well-known/openid-configuration/${fusionAuthTenantId}`,
            tenantId: fusionAuthTenantId, // Only required if you're using multi-tenancy
        }),
    ],
    pages: {
        signIn: '/login',
        error: '/error',
    },
}

const handler = NextAuth(authOptions)

export { handler as GET, handler as POST }

and these values setup in my .env file as such:

#FUSIONAUTH
# Note - While these are not actual values, gives an idea how they are setup. 
FUSIONAUTH_CLIENT_ID=277ae50583
FUSIONAUTH_CLIENT_SECRET=AeJ3phcpmlVEAY
FUSIONAUTH_URL=http://localhost:9011
FUSIONAUTH_API_KEY=l06CVWVemOBA13-eX_e
FUSIONAUTH_TENANT_ID=49427a8a-301d0
FUSIONAUTH_ISSUER=http://localhost:9011

How do I resolve the error Error: FUSIONAUTH_ISSUERmissing in environment variables. that was thrown if though FUSIONAUTH_ISSUER was setup and referenced from the .env file?