this error what does it mean please ??
See this to learn how to use PROGMEM:
Please don't post pictures of text. That is very unhelpful. When you encounter an error you'll see a button on the right side of the orange bar in the Arduino IDE "Copy error messages" (or the icon that looks like two pieces of paper at the top right corner of the black console window in the Arduino Web Editor). Click that button. In a message here, click the code tags button (</> on the forum toolbar) and then paste the error.
If the text exceeds the forum's 9000 character limit, save it to a .txt file and post it as an attachment. If you click the "Reply" button here, you will see an "Attachments and other settings" link.
It means, "Put the keyword 'const' in front of this declaration."
No one can read your picture. Use the copy error message button and post that text to the forum (in code tags).
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