omnet++ 5.0 installation .eclipse_keyring - installation

I have just installed the latest Omnet++ version on my Macbook Pro with OS X El Capitan.
When I start Omnet++ from the launcher icon, it show me the following warning message:
<b>"file doesn't exitst, ignoring: /Users/Jonathan/.eclipse_keyring"</b>
<br>
If I start the app from terminal, it doesn't show me any message. How can i fix it?

I'm not sure but probably Eclipse will create the necessary file and next time will not prompt you or you can try creating manually
$ cd /Users/Jonathan
$ touch .eclipse_keyring

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This Terminal Emulator is not functional because no 'bash' shell could be found.
Please correct the problem and restart the ID
This is a brand new OSX laptop with 10.13.6, and I've been trying to replicate the setup with aptana 3. I'm not sure what I'm missing to be getting this error... previous threads with similar errors all seem to be dealing with windows environments
I had the same issue on macOS Mojave 10.14 with AptanaStudio 3.7.2 and could fix it based on the suggestion here (which is for linux) https://stackoverflow.com/a/6685532/5220160
So assuming your AptanaStudio.app sits in /Applications the fix would be chmod +x /Applications/AptanaStudio.app/Contents/Eclipse/plugins/com.aptana.terminal_3.0.0.201802081530/os/macosx/redtty

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Mac terminal returns "xcrun: error: unable to exec Xcode native xcrun (Exec format error)."

Mac OS X V. 10.9.4 2.4 GHz 2 GB RAM
Im trying to use Git through my mac terminal and it keeps returning this error every time I submit a git command: "xcrun: error: unable to exec Xcode native xcrun (Exec format error).".
I already installed git and github in my mac. Im somehow new to programming I i don't really understand whats causing this error. Its getting very frustrating.
The following works for me:
sudo xcode-select --reset
The GUI equivalent of this is to log into the machine, open Xcode, go to preferences, locations, and set the active command line tools version of xcode
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TL/DR: I upgraded stuff and now I can't run "make" - wtf?
I just upgraded from Mac OS X 10.6 to 10.8 Mountain Lion, and then installed XCode 4 (formerly I had Developer/Applications/Xcode (3.something). XCode 4 installed through the App Store application to /Applications. Somewhere along the way, I can no longer run the "make" command. And I've tried looking in all the usual /bins but can't find a "make".
Anyone know how to get my "make" command back?
Upgrading Apple stuff always breaks something... (it also broke my "git" command but I got that one back)
You need to install the command line tools as described at installing "make" on Mac. They are not installed by default in Xcode 4.
Easiest way to install:
Launch XCode
Go to Preferences > Downloads > Components
Click "Install" next to 'Command Line Tools'

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