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Yes, when using Angular Material Theming with Sass, an error may occur if the "mat" namespace module is not available. The error message will typically include the words "SassError" and "Undefined variable."
The "mat" namespace module is a set of variables, mixins, and functions provided by Angular Material that make it easier to create custom themes. It includes variables like $mat-red and $mat-indigo, which are used to define the colors of various UI elements.
If the "mat" module is not available, the Sass preprocessor will not be able to find these variables and will throw an error. To fix this, make sure you have imported the "@angular/material/theming" module in your Sass file, which will include the "mat" namespace module.