Description:
Invalid [materials] : '...'
This means you have entered an invalid entry for the material column.
Materials may not contain:
Emojis
~ ` ! @ # $ % ^ & * ( ) _ - + = [ ] { } \ | / ? , . < >
More than 45 characters
Solution:
Remove the invalid characters.
Reduce the number of characters.
For more information about materials visit the documentation page.