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Eureka!

After some manual testing with different Windows environments looks like I found a root cause.

When using autocompletion in the terminal (I used Pycharm terminal in Windows, probably the same for any other setup), when you press tab after streamlit run m it suggests streamlit run .\main.py , and usually streamlit app works as expected.

But in this case we ended up to have main Script Path "C:\Users\AAA\Desktop\myproject\.\main.py" and Main Script directory "C:\Users\AAA\Desktop\myproject\." which then leads to this exception in st.page_link and in st.switch_page primitives.

So the temporarily workaround before fixing this issue, should be just run streamlit app without leading .\ prefix. Like streamlit run main.py instead of streamlit run .\main.py

Hello:

I have been making tests, here is the insight I have found:

Config 1, when logging in: On windows: streamlit run client.py --server.maxMessageSize 1000 --server.runOnSave=True st.switch_page(“pages/client_presentacion.py”) Sidebar links: file_presentacion = os.path.join(os.getcwd(), “pages”, “client_presentacion.py”) st.page_link(file_presentacion, label=“Presentación”, icon=“⚓”) It works! On linux container: ENTRYPOINT [“streamlit”, “run”, “client.py”, “–server.port=8501”, “–server.address=0.0.0.0”, “–server.maxMessageSize=1000”] StreamlitAPIException: Could not find page: ‘app/pages/client_presentacion.py’. Must be the file path relative to the main script, from the directory: app.

Traceback: File “/app/pages/client_presentacion.py”, line 11, in <module> create_sidebar() File “/app/client_menu.py”, line 36, in create_sidebar st.page_link(file_presentacion, label=“Presentación”, icon=“⚓”) So its not failing on the swtich page but the sidebar links

Config 2, when logging in: On windows: streamlit run client.py --server.maxMessageSize 1000 --server.runOnSave=True file_presentacion = os.path.join(os.getcwd(), “pages”, “client_presentacion.py”) st.switch_page(file_presentacion ) Sidebar links: file_presentacion = os.path.join(os.getcwd(), “pages”, “client_presentacion.py”) st.page_link(file_presentacion, label=“Presentación”, icon=“⚓”) It works again! On linux container: ENTRYPOINT [“streamlit”, “run”, “client.py”, “–server.port=8501”, “–server.address=0.0.0.0”, “–server.maxMessageSize=1000”] StreamlitAPIException: Could not find page: ‘app/pages/client_presentacion.py’. Must be the file path relative to the main script, from the directory: app.

Traceback: File “/app/client.py”, line 64, in <module> main() File “/app/client.py”, line 50, in main st.switch_page(file_presentacion) So its failing with the absolute path this time even though on windows works

Config 3, when logging in: On windows: streamlit run client.py --server.maxMessageSize 1000 --server.runOnSave=True st.switch_page(“pages/client_presentacion.py”) Sidebar links: st.page_link(“pages/client_presentacion.py”, label=“Presentación”, icon=“⚓”) It works again! On linux container: ENTRYPOINT [“streamlit”, “run”, “client.py”, “–server.port=8501”, “–server.address=0.0.0.0”, “–server.maxMessageSize=1000”] Now it works Aditional info: On windows, configs 1, 2,3 are not working when i move the project folder to a network location, they are only working on my desktop

So, to sum up: Windows–> It does work on my desktop but it doesnt on a shared folder, I didnt try the .\ because it finally worked on my container in config 3 Linux–> you can´t use absolute paths, use “/pages/my_file.py” and it works

Hello! I am @lovin-bear I deployed the app today in a python:3.11.7 container and the bug reapeared: Output when I run the code you provided in my windows 10 in the desktop folder as workdir (no bug): Main Script File

“client.py” Current Working Directory

“C:\Users\dfervenza\Desktop\streamlit_app” Normalized Current Working Directory

“C:\Users\dfervenza\Desktop\streamlit_app” Main Script Path

“C:\Users\dfervenza\Desktop\streamlit_app\client.py” Main Script Directory

“C:\Users\dfervenza\Desktop\streamlit_app” Normalized Path

“pages\client_presentacion.py” Requested Page

“C:\Users\dfervenza\Desktop\streamlit_app\pages\client_presentacion.py” All Pages Page

[ 0:{ “page_script_hash”:“2d5864fe4ab14d4494a119b54f63c3cf” “page_name”:“client” “icon”:“” “script_path”:“C:\Users\dfervenza\Desktop\streamlit_app\client.py” } 1:{ “page_script_hash”:“cc142648052dadf78337447bd7191077” “page_name”:“client_conclusiones” “icon”:“” “script_path”:“C:\Users\dfervenza\Desktop\streamlit_app\pages\client_conclusiones.py” } 2:{ “page_script_hash”:“4f96621512cbd9acde2076e5831b129a” “page_name”:“client_global” “icon”:“” “script_path”:“C:\Users\dfervenza\Desktop\streamlit_app\pages\client_global.py” } 3:{ “page_script_hash”:“b51c5769842dec072a4d71b980d28026” “page_name”:“client_presentacion” “icon”:“” “script_path”:“C:\Users\dfervenza\Desktop\streamlit_app\pages\client_presentacion.py” } 4:{ “page_script_hash”:“dae6dbb8b23c4dd436896d82c43f1653” “page_name”:“client_top_50” “icon”:“” “script_path”:“C:\Users\dfervenza\Desktop\streamlit_app\pages\client_top_50.py” } ] [Page Two](file:///C:/Users/dfervenza/Desktop/streamlit_app/pages/client_presentacion.py)

here is the output in the python container: Main Script File

“client.py” Current Working Directory

“/app” Normalized Current Working Directory

“/app” Main Script Path

“/app/client.py” Main Script Directory

“/app” Normalized Path

“pages/client_presentacion.py” Requested Page

“/app/pages/client_presentacion.py” All Pages Page

[ 0:{ “page_script_hash”:“2d5864fe4ab14d4494a119b54f63c3cf” “page_name”:“client” “icon”:“” “script_path”:“/app/client.py” } 1:{ “page_script_hash”:“4c4eec49987892b5edc73cd0801ae620” “page_name”:“client_conclusiones” “icon”:“” “script_path”:“/app/pages/client_conclusiones.py” } 2:{ “page_script_hash”:“6aa48767d3d240e31992a9403ec7d9bf” “page_name”:“client_global” “icon”:“” “script_path”:“/app/pages/client_global.py” } 3:{ “page_script_hash”:“b08d81b3c82fc0653878f615dfef68b0” “page_name”:“client_presentacion” “icon”:“” “script_path”:“/app/pages/client_presentacion.py” } 4:{ “page_script_hash”:“6ee34f47fd89acf239ddd0ac73ea5532” “page_name”:“client_top_50” “icon”:“” “script_path”:“/app/pages/client_top_50.py” } ] Page Two

The thing is that I have a loggin page: if st.button(“Aceptar”, type=“primary”): if usuario == “paco” and password == “paco”: st.session_state[“logeado”] = True st.success(“Sesion iniciada”) time.sleep(0.50) st.switch_page(file_presentacion) The bug appears when logging in, if i click on page 2, it redirects to main page so the bug does not appear:

StreamlitAPIException: Could not find page: ‘app/pages/client_presentacion.py’. Must be the file path relative to the main script, from the directory: app.

Traceback: File “/app/client.py”, line 102, in <module> main() File “/app/client.py”, line 88, in main st.switch_page(file_presentacion)

Please tell me if you need more info

Hey @esan94 and @lovin-bear ! Thank you so much for your help.

Not having windows laptops makes debugging a little harder. I was hoping to reproduce this on a windows laptop, but after getting it set up, it worked as expected.

I think @esan94 is providing some interesting insight with this weird . in the path. I’m trying to figure out where it’s coming from. Is it possible to run the following Streamlit script and share the output? I would appreciate any output from people who are experiencing this error. My only thought is that os.getcwd() get current working directory is providing the extra ., which makes this really weird.

import os
import streamlit as st
from streamlit import source_util
from streamlit.runtime.scriptrunner import get_script_run_ctx


page = "pages/page_two.py" # MODIFY TO YOUR PAGE

ctx = get_script_run_ctx()
ctx_main_script = ""
if ctx:
  ctx_main_script = ctx.main_script_path

st.write("**Main Script File**")
st.text(f"\"{ctx_main_script}\"")

st.write("**Current Working Directory**")
st.text(f"\"{os.getcwd()}\"")

st.write("**Normalized Current Working Directory**")
st.text(f"\"{os.path.normpath(os.getcwd())}\"")

st.write("**Main Script Path**")
main_script_path = os.path.join(os.getcwd(), ctx_main_script)
st.text(f"\"{main_script_path}\"")

st.write("**Main Script Directory**")
main_script_directory = os.path.dirname(main_script_path)
st.text(f"\"{main_script_directory}\"")

st.write("**Normalized Path**")
page = os.path.normpath(page)
st.text(f"\"{page}\"")

st.write("**Requested Page**")
requested_page = os.path.join(main_script_directory, page)
st.text(f"\"{requested_page}\"")

st.write("**All Pages Page**")
all_app_pages = list(source_util.get_pages(ctx_main_script).values())
st.json(all_app_pages, expanded=True)

st.page_link(page, label="Page Two")

Welcome to screenshot, but I can determine where it’s coming from

Hey @esan94, thank you for opening this issue!

I was able to reproduce the problem on Windows, and I can confirm that this is a bug.