I have not used Cadanra2 recently so long and started from a new installation,
but seemingly have a problem with launching Cadabra2 in my Mac (OS: Sierra 10.12.6).
In the installation I have not got any error message. Also, I tried finding a similar problem in Q&A but could not find it. (Sorry if there is any.)
Below is what I got by trying launching "cadabra2":
*Traceback (most recent call last):
File "/usr/local/bin/cadabra2", line 22, in module
from cadabra2 import
ImportError: dlopen(/usr/local/lib/python3.6/site-packages/cadabra2.so, 2): Library not loaded: @executable_path/../Frameworks/wstp.framework/Versions/4.36/wstp
Referenced from: /usr/local/lib/python3.6/site-packages/cadabra2.so
Reason: image not found**
Also, the next is what was obtained by carrying out "cadabra2-gtk"
cadabra-client: spawning server
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: ImportError: dlopen(/usr/local/opt/python3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cadabra2.so, 2): Library not loaded: @executable_path/../Frameworks/wstp.framework/Versions/4.36/wstp
Referenced from: /usr/local/opt/python3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cadabra2.so
Reason: image not found
libc++abi.dylib: terminating with uncaught exception of type std::logic_error: Failed to read port from server.
Abort trap: 6
P.S. I took off the bra and ket from "string" and "module" in the above.