Lottie Animation is not working in Windows

[tamalmaity-dev]

Duplicate Check

• I have searched the opened issues and there are no duplicates

Describe the bug

Problem with Lottie animation

I am encountering an Unknown control: lottie error when trying to use the Lottie control in my Flet application, even though the flet-lottie package is installed in my environment.

Environment:

• Flet Version: >=0.27.6
• flet-lottie Version: 0.1.0
• Operating System: Windows
• Python Version: 3.13.3

     ft.Lottie(
                     src="assets/earth.json", # Use the path directly
                     animate=True,
                      repeat=True,
                      width=200,
                      height=200,
                 )

but every time getting error : Unknown control: lottie

I also try different approach ..

import flet as ft
from flet_lottie import Lottie
import base64
import os

# Assume assets/satellite-earth-orbiting.json exists and is valid
LOTTIE_JSON_PATH = "assets/satellite-earth-orbiting.json"

def main(page: ft.Page):
    page.title = "Lottie Test"
    page.vertical_alignment = ft.MainAxisAlignment.CENTER

    json_base64 = None
    try:
        # Adjust path finding if necessary for the minimal example
        script_dir = os.path.dirname(os.path.abspath(__file__))
        absolute_path = os.path.normpath(os.path.join(script_dir, LOTTIE_JSON_PATH))
        with open(absolute_path, "r", encoding="utf-8") as f:
            json_data = f.read()
            json_base64 = base64.b64encode(json_data.encode('utf-8')).decode('utf-8')
    except Exception as e:
        print(f"Error loading Lottie JSON: {e}")
        # Add a text control showing the error if loading fails
        page.add(ft.Text(f"Error loading Lottie JSON: {e}"))
        return # Stop if loading failed

    if json_base64:
        lottie_control = Lottie(
            src_base64=json_base64,
            animate=True,
            repeat=True,
            width=200,
            height=200,
        )
        page.add(lottie_control)
    else:
         page.add(ft.Text("Lottie JSON could not be loaded."))


    page.update()

if __name__ == "__main__":
    ft.app(target=main, assets_dir="assets")

Still getting same ERROR: Unknown control: lottie

Code sample

Code

     ft.Lottie(
                     src="assets/earth.json", # Use the path directly
                     animate=True,
                      repeat=True,
                      width=200,
                      height=200,
                 )

To reproduce

• Set up a Python environment with flet>=0.27.6 and flet-lottie==0.1.0 .
• Create a simple Flet app using the Lottie control as shown above (using either src or src_base64 ).
• Ensure a valid Lottie JSON file exists at the specified path.
• Run the Flet application ( python main.py ).

Expected behavior

The Lottie animation should be displayed in the Flet window without errors.

Actual Behavior:

The application fails with the error message: Exception: Unknown control: lottie (or similar traceback indicating the control is not recognized).

Troubleshooting Steps Taken:

• Confirmed flet-lottie is installed in the correct Python environment using pip list or uv pip list .
• Tried reinstalling dependencies ( pip install -r requirements.txt --force-reinstall or uv sync --reinstall ).
• Verified the Python interpreter used by the IDE/terminal matches the environment where packages are installed.
• Restarted the IDE.
• Tried loading the Lottie file using both src (relative path) and src_base64 .

Screenshots / Videos

Captures

[Upload media here]

Operating System

Windows

Operating system details

Windows 11

Flet version

0.27.6

Regression

No, it isn't

Suggestions

Please fix this issue

Logs

Logs

[Paste your logs here]

Additional details

No response

[NiTRoeSE]

I have excact the same issue with same behavior.
Any suggestions or workaround known ?
Help or a fix would be great. Thanks in advanced!

PS:

Have this issue with flet 0.28.2 and 0.28.3 ( no other version tested)

[SIRGPrice]

Try:

PATH = "assets/LottieAnimation.json"

with open(PATH, "r", encoding="utf-8") as json_file:
        json_data = json_file.read()
        
json_base64 = base64.b64encode(json_data.encode('utf-8')).decode('utf-8')

animacion = flet_lottie.Lottie(
    src_base64=json_base64,
    reverse=True,
    repeat=True,
    width=100,
    height=100
)

Use directly a constant that contains: "assets/LottieAnimation.json"

It works just perfect for me in the latest version.