Update app.py

app.py

@@ -384,7 +384,7 @@ def invoke (prompt, file, history, rag_option, model_option, openai_api_key, k=3
         #LLM auswählen (OpenAI oder HF)
         ###########################
         if (model_option == "OpenAI"):
-            text = prompt
+            text = str(prompt)
             #Anfrage an OpenAI ----------------------------
             if (text.find('Bild zeichnen')):
                 llm = ChatOpenAI(model_name = MODEL_NAME_OAI_ZEICHNEN,  openai_api_key = openai_api_key, temperature=temperature)#, top_p = top_p)