feat: ADd warning from poetry -> uv

README.md

@@ -252,6 +252,12 @@ or
 python src/my_project/main.py
 ```
 
+If an error happens due to the usage of poetry, please run the following command to update your crewai package:
+
+```bash
+crewai update
+```
+
 You should see the output in the console and the `report.md` file should be created in the root of your project with the full final report.
 
 In addition to the sequential process, you can use the hierarchical process, which automatically assigns a manager to the defined crew to properly coordinate the planning and execution of tasks through delegation and validation of results. [See more about the processes here](https://docs.crewai.com/core-concepts/Processes/).

src/crewai/cli/run_crew.py

@@ -2,13 +2,32 @@
 
 import click
 import tomllib
+from packaging import version
+
+from crewai.cli.utils import get_crewai_version
 
 
 def run_crew() -> None:
     """
     Run the crew by running a command in the UV environment.
     """
     command = ["uv", "run", "run_crew"]
+    crewai_version = get_crewai_version()
+    min_required_version = "0.71.0"
+
+    with open("pyproject.toml", "rb") as f:
+        data = tomllib.load(f)
+
+    if data.get("tool", {}).get("poetry") and (
+        version.parse(crewai_version) < version.parse(min_required_version)
+    ):
+        click.secho(
+            f"You are running an older version of crewAI ({crewai_version}) that uses poetry pyproject.toml. "
+            f"Please run `crewai update` to update your pyproject.toml to use uv.",
+            fg="red",
+        )
+        print()
+
     try:
         subprocess.run(command, capture_output=False, text=True, check=True)