An error in a program that involves a violation of language rules will be detected at  time.

The statement refers to a syntax error in programming. Syntax errors occur when the code violates the grammatical rules of the programming language. These errors are typically detected at compile time (for compiled languages) or at runtime (for interpreted languages), depending on how the program is executed.

1. Compile Time: In languages that require a compilation step, such as C or Java, syntax errors are caught by the compiler before the program runs. The compiler checks the code for adherence to the language's syntax rules and raises errors if it encounters any violations.

2. Runtime: In interpreted languages like Python or Ruby, the interpreter checks syntax when the script is executed. Any syntax errors will halt the execution of the program and provide an error message.

In conclusion, the detection of syntax errors can happen either at compile time or runtime, depending on the programming language used. This is critical to ensure that the code can run successfully without logical or structural issues.