SassError 90 var--num is not a number

This error message indicates that there is an issue with a Sass variable called "--num". The value assigned to this variable is not recognized as a number, which may be causing issues in the code.

To fix this error, check the value assigned to the "--num" variable and make sure it is a valid number. If the value is not intended to be a number, consider changing the variable name to something more appropriate.

Additionally, check for any other variables or code that may be referencing the "--num" variable and ensure they are using the correct syntax and data type.