diff --git a/agentverse/tasksolving.py b/agentverse/tasksolving.py
index 2bd2bd9b7..d9bc9628c 100644
--- a/agentverse/tasksolving.py
+++ b/agentverse/tasksolving.py
@@ -37,14 +37,14 @@ def from_task(cls, task: str, tasks_dir: str):
         # Build agents for all pipeline (task)
         agents = {}
         for i, agent_config in enumerate(task_config["agents"]):
-            agent_type = AGENT_TYPES(i)
-            if i == 2 and agent_config.get("agent_type", "") == "critic":
+            if agent_config.get("agent_type", "") == "critic":
                 agent = load_agent(agent_config)
-                agents[agent_type] = [
+                agents[AGENT_TYPES.CRITIC] = [
                     copy.deepcopy(agent)
                     for _ in range(task_config.get("cnt_agents", 1) - 1)
                 ]
             else:
+                agent_type = AGENT_TYPES.from_string(agent_config.get("agent_type", ""))
                 agents[agent_type] = load_agent(agent_config)
 
         env_config["agents"] = agents
diff --git a/agentverse/utils.py b/agentverse/utils.py
index 196d0ba2e..1eeb198fb 100644
--- a/agentverse/utils.py
+++ b/agentverse/utils.py
@@ -35,6 +35,21 @@ class AGENT_TYPES(Enum):
     EVALUATION = 4
     MANAGER = 5
 
+    @staticmethod
+    def from_string(agent_type: str):
+        str_to_enum_dict = {
+            "role_assigner": AGENT_TYPES.ROLE_ASSIGNMENT,
+            "solver": AGENT_TYPES.SOLVER,
+            "critic": AGENT_TYPES.CRITIC,
+            "executor": AGENT_TYPES.EXECUTION,
+            "evaluator": AGENT_TYPES.EVALUATION,
+            "manager": AGENT_TYPES.MANAGER,
+        }
+        assert (
+            agent_type in str_to_enum_dict
+        ), f"Unknown agent type: {agent_type}. Check your config file."
+        return str_to_enum_dict.get(agent_type.lower())
+
 
 class Singleton(abc.ABCMeta, type):
     """