Tabs are used

Using tab characters (\t) for indentation or spacing in source files can cause inconsistency in the style of formatting. When enabled, this linting rule reports the use of tab characters.

entity example is
	port(
        clk : in std_logic;
        rst : in std_logic
    );
end entity example;

Note that this rule is set to ignore by default.

Rule Configuration

This rule can be disabled for your project, or its severity and parameters can be modified in the project linting settings. Alternatively, it can be manually configured with the following template:

99/severity/${path}={error|warning|info|ignore}