Update app.py

app.py

@@ -17,6 +17,12 @@ import os
 os.system("pip install --no-cache-dir numpy==1.23.5 spacy==3.5.3 thinc==8.1.8 pydantic<2.0")
 import spacy
 
+# ✅ Load the NLP model **before using it**
+try:
+    nlp = spacy.load("en_core_web_sm")
+except OSError:
+    st.error("Spacy model 'en_core_web_sm' is not installed. Run `python -m spacy download en_core_web_sm` in your environment.")
+    nlp = None  # Prevents crashing
 
 def extract_equation_params(text):
     """