Hi,
I’m using Joplin 1.0.125 (prod, darwin) on Mac 10.14.2.  The contents are encrypted.  The repository is DropBox.
I wanted to enable an external editor for some more complicated documents.  I  use an editor called iA Writer.
The precise configuration in Joplin is:
Text editor command  "/Applications/iA Writer.app/Contents/MacOS/iA Writer"
Open Joplin. 
Select the Note I wish to edit. 
Place the cursor the Note. 
CMD E  (using the mouse has the same effect) 
 
I get this error which apparently comes from iA Writer:
If I change the editor to Sublime Text "/Applications/Sublime Text.app/Contents/MacOS/Sublime Text" everything works as expected.
             
            
               
               
               
            
            
           
          
            
              
                tessus  
                
               
                 
              
                  
                    27 January 2019 02:01
                   
                   
              2 
               
             
            
              While it looks like an iA Writer specific problem, maybe it’s a combination of several factors. Are there any errors in the debug  log?
In my case the file is created as follows: 
Anyway, can you try to open your note from Joplin with external editor set to Sublime Text. Then you will see that a file was created in that directory. 
Now please try to open this file with iA Writer. Does this work?
             
            
               
               
               
            
            
           
          
            
            
              Thanks for your help with this.
Log:
2019-01-27 09:10:20: "Reducer action", "NOTE_SELECT, 7bad43f333cd47a78f2a1c48235ebc43"
2019-01-27 09:10:25: "ResourceService::indexNoteResources: Start"
2019-01-27 09:10:25: "ResourceService::indexNoteResources: Completed"
2019-01-27 09:10:25: "ResourceService::deleteOrphanResources:", "[]"
2019-01-27 09:10:34: "Reducer action", "WINDOW_COMMAND"
2019-01-27 09:10:34: "Reducer action", "WINDOW_COMMAND"
2019-01-27 09:10:34: "ExternalEditWatcher: Event: add: /Users/dchristian/.config/joplin-desktop/tmp/7bad43f333cd47a78f2a1c48235ebc43.md"
2019-01-27 09:10:34: "Started editor with PID 23583"
2019-01-27 09:10:34: "Reducer action", "NOTE_FILE_WATCHER_ADD, 7bad43f333cd47a78f2a1c48235ebc43"
2019-01-27 09:10:34: "ExternalEditWatcher: Started watching /Users/dchristian/.config/joplin-desktop/tmp/7bad43f333cd47a78f2a1c48235ebc43.md"
 
And the file permissions:
-rw-r--r-- 1 dchristian staff 22542 Jan 27 09:10 7bad43f333cd47a78f2a1c48235ebc43.md
I can open and edit the files in . /Users/dchristian/.config/joplin-desktop/tmp/
This is not ideal, but is manageable.
Thanks.
             
            
               
               
               
            
            
           
          
            
            
              I figured this out, after doing a bit more searching.
the “Text editor command” should be altered to:
open -a "iA Writer"
 
Then everything is good.
Thanks for your help.
             
            
               
               
               
            
            
           
          
            
            
              @cirrusnine  I got exactly the same error and when I tried to alter the “Text editor command” following your solution, the command  open -a "iA Writer" will be break to new line.
Do you happen to see this problem?
             
            
               
               
               
            
            
           
          
            
            
              I tried to alter it again and it works.
I think Joplin the problem is Joplin automatically move anything recognized as a “arguments” to the “Arguments” field…