[BUG][ED] Error: Starting NeoLemmix.exe failed or was aborted

[Guigui]

Hello,

A friend of mine installed NeoLemmix 12.14 and NLEditor 2.0 in the same folder. When he creates a level and tries to playtest it via the "Play Level" in the editor, he gets the following error :

Code Select Expand

Error: Starting NeoLemmix.exe failed or was aborted
Also in his main directory with NL and NLEditor, he has a file named ErrorLog with the following content :

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20260422155035
System.ComponentModel.Win32Exception (0x80004005): L'opération a été annulée par l'utilisateur
à System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo)
à System.Diagnostics.Process.Start()
à System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
à NLEditor.NLEditForm.PlaytestLevel()
Any idea what the problem might be ?

For now he launches the created level manually with NL 12.14 to playtest, but it is quite annoying.

[WillLem]

Any idea what the problem might be ?

I've been unable to replicate this. Editor 2.0 correctly opens playtest levels in both NeoLemmix 12.14 and NeoLemmix CE 1.1 on my system.

"L'opération a été annulée par l'utilisateur" translates as "the operation was cancelled by the user", which suggests that something is stopping NeoLemmix from running on your friend's computer.

Best guess is that AV/firewall is blocking the .exe from running, or Windows has the app marked as untrusted. To fix this, NeoLemmix.exe will have to be added to the 'safe programs' list in whichever AV your friend uses. If that doesn't fix the issue, report back and let me know.

[Guigui]

Yes you're right, the firewall was blockinh NL from launchung via NLEditor. Solved now, thank you.