Singularize model names.

app/Models/Server.php

@@ -253,7 +253,7 @@ class Server extends Model
      */
     public function option()
     {
-        return $this->belongsTo(ServiceOptions::class);
+        return $this->belongsTo(ServiceOption::class);
     }
 
     /**

app/Models/ServerVariables.php

@@ -59,6 +59,6 @@ class ServerVariables extends Model
       */
      public function variable()
      {
-         return $this->belongsTo(ServiceVariables::class, 'variable_id');
+         return $this->belongsTo(ServiceVariable::class, 'variable_id');
      }
 }

app/Models/Service.php

@@ -49,7 +49,7 @@ class Service extends Model
      */
     public function options()
     {
-        return $this->hasMany(ServiceOptions::class);
+        return $this->hasMany(ServiceOption::class);
     }
 
     /**
@@ -60,7 +60,7 @@ class Service extends Model
     public function packs()
     {
         return $this->hasManyThrough(
-            'Pterodactyl\Models\ServicePack', 'Pterodactyl\Models\ServiceOptions',
+            'Pterodactyl\Models\ServicePack', 'Pterodactyl\Models\ServiceOption',
             'service_id', 'option_id'
         );
     }

app/Models/ServiceOptions.php

@@ -26,7 +26,7 @@ namespace Pterodactyl\Models;
 
 use Illuminate\Database\Eloquent\Model;
 
-class ServiceOptions extends Model
+class ServiceOption extends Model
 {
     /**
      * The table associated with the model.
@@ -100,7 +100,7 @@ class ServiceOptions extends Model
       */
      public function variables()
      {
-         return $this->hasMany(ServiceVariables::class, 'option_id');
+         return $this->hasMany(ServiceVariable::class, 'option_id');
      }
 
      /**

app/Models/ServicePack.php

@@ -64,6 +64,6 @@ class ServicePack extends Model
       */
      public function option()
      {
-         return $this->belongsTo(ServiceOptions::class);
+         return $this->belongsTo(ServiceOption::class);
      }
 }

app/Models/ServiceVariables.php

@@ -26,7 +26,7 @@ namespace Pterodactyl\Models;
 
 use Illuminate\Database\Eloquent\Model;
 
-class ServiceVariables extends Model
+class ServiceVariable extends Model
 {
     /**
      * The table associated with the model.