fix: undefined StableDiffusionSafetyChecker

app.py

@@ -21,6 +21,7 @@ from diffusers import (
     DPMSolverMultistepScheduler,
     EulerDiscreteScheduler
 )
+from diffusers.pipelines.stable_diffusion.safety_checker import StableDiffusionSafetyChecker
 from transformers import AutoFeatureExtractor
 import random
 import time