Fatal error: Uncaught Error: Class 'yii\widgets\ActiveForm' not found in /app/backend/views/contrato/solicitud/busqueda/inicio-administrador-solicitud-contrato-form.php:36 Stack trace: #0 {main} thrown in /app/backend/views/contrato/solicitud/busqueda/inicio-administrador-solicitud-contrato-form.php on line 36