MATLAB: Dot indexing is not supported for variables of this type: Error message after Matlab startup.

Question

I am recieving error message:

Dot indexing is not supported for variables of this type.
Error in rmiml.getAll
and 
Error in matlab.internal.codingui.warmupProgrammingAids

straight after start up..

When I try to run imshow() the same error appers again and no figure is generated.

Dot indexing is not supported for variables of this type.
Error in imshow (line 269)
    style = s.matlab.imshow.InitialMagnificationStyle.ActiveValue;

Now I use Matlab 2020a but I had the same problem with Matlab 2017. But 2017 worked well some time ago…

Answer 1

RESOLVED

root cause similar to this:

https://uk.mathworks.com/matlabcentral/answers/480471-returns-error-after-clicking-on-a-plot

current folder contained my own .m file called settings..