"Invalid mount path" error using Lean via Docker Toolbox

Hi Giuseppe,

Thanks for reporting the issue, I just released a new version that fixes it. You can update using `pip install --upgrade lean`.

Hi Jasper,

first of all thank you so much for your kindness. This time I could start the backtest command, but for some reasons the build fails:

Digest: sha256:c71599a750de737fe69c3873ab542679ff875bcaa98654df58c2aa9908c99459
Status: Downloaded newer image for quantconnect/lean:latest
docker.io/quantconnect/lean:latest
Microsoft (R) Build Engine version 16.9.0+57a23d249 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
 Determining projects to restore...
/usr/share/dotnet/sdk/5.0.203/NuGet.targets(131,5): error : No space left on device
[/LeanCLI/Candler.csproj]
Build FAILED.
/usr/share/dotnet/sdk/5.0.203/NuGet.targets(131,5): error : No space left on device
[/LeanCLI/Candler.csproj]
   0 Warning(s)
   1 Error(s)
Time Elapsed 00:00:57.54
Error: Something went wrong while running 'Candler' in the 'backtesting' environment, the output is stored in
'Candler\backtests\2021-06-16_22-39-17'

If I go to the “2021-06-16_22-39-17” folder, it is empty.

Any idea? 

Thanks again, I really appreciate.

Hi Giuseppe,

The error you are seeing most likely means the VM which Docker runs in ran out of disk space. Can you try running `docker system prune --all` to make Docker remove unused containers and images to clean up some space?

If that doesn't fix the issue I'm afraid you're going to have to re-create the VM and give it more disk space. You can do this by running `docker-machine rm <machine name>` and `docker-machine create -d virtualbox --virtualbox-disk-size "100000" <machine name>` in a terminal other than Docker Toolbox's Quickstart Terminal. `<machine name>` should be the name of the VM, which is “default” if you haven't manually created your current VM. “100000” is the size of the new VM's disk in MB which I have I have set to 100GB, if your PC doesn't have that much disk space left you may have to reduce it.

Be aware that re-creating the VM deletes all existing containers, volumes, and images.

Thanks again. I have tried both your suggestions (pruning and re-creating the VM). The VM planned size is now 65G and I don't get the “no space” error anymore, but only a generic

Digest: sha256:a819082d6ebbf3056dab81a662e06e9213b35050207a6467905c0b4f20f294e8
Status: Downloaded newer image for quantconnect/lean:latest
docker.io/quantconnect/lean:latest
Microsoft (R) Build Engine version 16.9.0+57a23d249 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
 Determining projects to restore...
Error: Something went wrong while running 'Candler' in the 'backtesting' environment, the output is stored in
'Candler\backtests\2021-06-17_22-10-53'

…and once again the folder ‘2021-06-17_22-10-53’ is empty.

Here is a screenshot of the disk space before and after the lean backtest command (which, in turns, update itself):

 Please know that I sincerely appreciate your help.

It seems like the execution cannot go beyond the “Determining projects to restore” step. Is it supposed to create a “.csproj” file? Maybe cannot write on the destination folder? 

Just trying to understand…

Hi Giuseppe,

Weird. If for whatever reason the CLI cannot generate a .csproj file to compile with the error would be different (something along the lines of “Project file does not exist”), so I don't think it's that. Can you try running `lean create-project --language python PythonProject` and `lean backtest PythonProject` to check whether this issue also occurs with Python projects?

I think its still a space issue the / mount is full

I tried Jasper's suggestion.

C:\My projects\Lean>lean backtest PythonProject
←[?1h←=20210618 06:53:10.459 TRACE:: Config.GetValue(): debug-mode - Using default value: False
20210618 06:53:10.485 TRACE:: Config.Get(): Configuration key not found. Key: plugin-directory - Using default value:
20210618 06:53:10.512 TRACE:: Composer(): Loading Assemblies from /Lean/Launcher/bin/Debug
20210618 06:53:10.815 TRACE:: Python for .NET Assembly: Python.Runtime, Version=2.0.4.0, Culture=neutral,
PublicKeyToken=5000fea6cba702dd
20210618 06:53:11.561 TRACE:: Config.Get(): Configuration key not found. Key: data-directory - Using default value:
../../../Data/
20210618 06:53:11.570 TRACE:: Config.Get(): Configuration key not found. Key: version-id - Using default value:
20210618 06:53:11.571 TRACE:: Config.Get(): Configuration key not found. Key: cache-location - Using default value:
/Lean/Data
20210618 06:53:11.573 TRACE:: Engine.Main(): LEAN ALGORITHMIC TRADING ENGINE v2.5.0.0 Mode: DEBUG (64bit) Host:
Gwydjon-H
20210618 06:53:11.667 TRACE:: Engine.Main(): Started 6:53 AM
20210618 06:53:11.676 TRACE:: Config.Get(): Configuration key not found. Key: lean-manager-type - Using default value:
LocalLeanManager
Unhandled exception. System.IO.FileNotFoundException: JobQueue.TryCreatePythonAlgorithm(): Unable to find py file:
/LeanCLI/main.py
  at QuantConnect.Queues.JobQueue.GetAlgorithmLocation() in
/LeanCloud/CI.Builder/bin/Debug/src/QuantConnect/Lean/Queues/JobQueue.cs:line 163
  at QuantConnect.Queues.JobQueue.NextJob(String& location) in
/LeanCloud/CI.Builder/bin/Debug/src/QuantConnect/Lean/Queues/JobQueue.cs:line 73
  at QuantConnect.Lean.Launcher.Program.Main(String[] args) in
/LeanCloud/CI.Builder/bin/Debug/src/QuantConnect/Lean/Launcher/Program.cs:line 94
Error: Something went wrong while running 'PythonProject' in the 'backtesting' environment, the output is stored in
'PythonProject\backtests\2021-06-18_08-53-07'

Ok, I don't know how but it seems to work now :)

Basically I changed the path of my Lean local projects (which previously included a space in it - “C:\My Projects\Lean”) and moved everything on a more *nix-acceptable path ("C:\MyProjects\Lean").

Also, I had to include the Lean local path into the VM shared folders (mount: “/c/MyProjects/Lean”).

This did the trick!

I hope that this could help others having a similar issue. Thanks again for your precious support!

I had a similar error when I initialized a Lean folder on my D:\ drive.  This error:   "…. Unable to find py file: /LeanCLI/main.py"  

Solution was to move everything to  C:\myLeanFolder\