Netgen fails to launch under MacOS

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1

I have a Mac running MacOS Mojave. I downloaded and installed Python 3.7 and Netgen according to the installation instructions. When I double click on Netgen in the Applications folder, I see the glimpse of a window, then nothing. Not sure what I am doing wrong.

2

open a terminal and start Netgen from there as

/Applications/Netgen.app/Contents/MacOS/netgen

Then you should see an error message.

best, Joachim

3

Here is the output:

**
~/% /Applications/Netgen.app/Contents/MacOS/netgen
dyld: Library not loaded: /Library/Frameworks/Python.framework/Versions/3.7/Python
Referenced from: /Applications/Netgen.app/Contents/MacOS/netgen
Reason: image not found
Abort
**

As noted above, I installed Python 3.7 by clicking on the link in the Netgen installation instructions for MacOS.

4

Can it be that you installed Python 3.8, and not Python 3.7 ?

What do you get when you enter

which python3

5

I get

/Library/Frameworks/Python.framework/Versions/3.8/bin/python3

So, yes, I installed 3.8, but I did this by clicking on the ngsolve.org link for installing Python, which explicitly says 3.7.

6

I went to Python site and retrieved 3.7.5; works OK now.

7

I have similar problems.

When I type netgen in the terminal under MacOS, there is some error:

dyld: Library not loaded: /Library/Frameworks/Python.framework/Versions/3.8/Python
Referenced from: /Applications/Netgen.app/Contents/MacOS/netgen
Reason: image not found
[1] 73123 abort netgen

When I type which python3, it comes:

/usr/local/bin/python3

8

With the latest Version 2003 we switched to Python 3.8 on MacOS. See NGSolve Download page.
Joachim

9

I am getting this error

/Applications/Netgen.app/Contents/MacOS/startup.sh ; exit;
dyld: Symbol not found: __ZdaPvSt11align_val_t
Referenced from: /Applications/Netgen.app/Contents/MacOS/libngcore.dylib
Expected in: /usr/lib/libc++.1.dylib
in /Applications/Netgen.app/Contents/MacOS/libngcore.dylib
/Applications/Netgen.app/Contents/MacOS/startup.sh: line 10: 26830 Abort trap: 6 $Netgen_MACOS/netgen

I don’t know how to fix it. Please help.
Thank you.

10

I am getting this error. I have 3.8 python

/Applications/Netgen.app/Contents/MacOS/startup.sh ; exit;
dyld: Symbol not found: __ZdaPvSt11align_val_t
Referenced from: /Applications/Netgen.app/Contents/MacOS/libngcore.dylib
Expected in: /usr/lib/libc++.1.dylib
in /Applications/Netgen.app/Contents/MacOS/libngcore.dylib
/Applications/Netgen.app/Contents/MacOS/startup.sh: line 10: 26830 Abort trap: 6 $Netgen_MACOS/netgen

Please help to fix it. Thank you.