Syms toolbox / symengine not working

I haven't been able to get my syms toolbox working, entering the command 'syms a b c' in any of my scripts prompts all the errors shown in the attached picture, this is after an uninstall of matlab 2017a where syms didn't work either, to an installation of matlab 2018b. I have tried restarting my computer, I have tried copying the files symengine.m and symengine.p into my work folder and running them, which did temporarily allow me to use the 'syms' command, but then upon running a script it stopped functioning again.

A picture of the code causing the issue is also attached.

I have done a search of the errors popping up, but have been unable to find others having the same error.

any help would be greatly appreciated, thanks in advance.

[Walter Roberson]

/Applications/MATLAB_R2018b.app/toolbox/symbolic/symbolic/private/symIsMember.m

What do you see in toolbox/symbolic/symbolic/private under matlabroot() ?

[Magnus Rasmussen]

I see the four files:

Sortrows.m

symIsMember.m

symUnique.m

symUnique.p

[Walter Roberson]

Try executing

 restoredefaultpath
 rehash toolboxcache

[Magnus Rasmussen]

Just tried it and the same error still occurs. I tried running it before my script, and putting it in my script after clear, clc, ad close all

[Walter Roberson]

What shows up for

which -all symIsMember

[Magnus Rasmussen]

I get this message:

C:\Program Files\MATLAB\R2018b\toolbox\symbolic\symbolic\private\symIsMember.m % Private to symbolic

[Walter Roberson]

It does not make sense to me that it would be able to find it that way but not when you are executing a basic syms command.

I would suggest reinstalling, and if that does not work, then contacting Mathworks for free installation support.

One last thing: what shows up for

which -all sysms

[Magnus Rasmussen]

I will try reinstalling then, thank you for your help!

I get:

C:\Program Files\MATLAB\R2018b\toolbox\symbolic\symbolic\syms.m