Update app.py

app.py

@@ -83,6 +83,8 @@ population_size = st.sidebar.slider("Population size", 10, 100, 50)
 num_tasks = st.sidebar.slider("Number of tasks", 1, 10, 5)
 num_generations = st.sidebar.slider("Number of generations", 1, 100, 10)
 
+gas = None
+
 # Run the evolution
 if st.button("Run evolution"):
     gas = [GeneticAlgorithm(population_size, task_id) for task_id in range(num_tasks)]