Project_21_scrolling_matrix:9: error: variable 'font' must be const in order to

Sorry people. I know this has come up loads of times with many resolutions but I just cant find a resolve for students. I have copied the code for the sketch "scrolling matrix" verbatim but I cannot get past the error message regarding the "Project_21_scrolling_matrix:9: error: variable 'font' must be const in order to be put into read-only section by means of 'attribute((progmem))'"
I am confused by the many answers but none of them seem to fit this particular project.
Can anyone help me please?
Regards Muddy1

Can anyone help me please?

Seeing the code that is causing the problem would help considerably ......

Please read the 2 posts by Nick Gammon at the top of this forum and follow the advice given in them.

Progmem memory must be specified as const since IDE v1.5.

There has been lots on this in the forums.

the code that causes the problem is...static byte font[] [8] PROGMEM = {. It then comes up with the error in the subject line. Sorry if this is old news but I dont get clarification from previous posts.

Static const byte ...

Thanks Marco I'll give it a shot.