Error using cvload Assertion failed

Hello,

I am trying to use MATLAB R2018b and I currently encounter mutiple difficulties to make it simple run.

Today I am facing a new error when using cvload function.

I have loaded multiple cvt files and then saved them into a single cumultative file using cvload ans cvsave functions. Up to that point, everything seems alright but this is just illusion.

When I try to load again the cumulative cvt file using cvload function at command window prompt, the command fails with the enigmatic message:

Error using cvload

Assertion failed.

Everyone can see that this is not a very useful message indeed.

Deos anyone know how I can get more information about the cause of this problem (log or trace file,...) ?

Thank you for help.

Best regards.