Tex: Why I get undefined control sequence with cline?

Tex: Why I get undefined control sequence with cline?

The 'undefined control sequence' error for `\cline` in LaTeX typically indicates that the necessary package providing this command has not been loaded. `\cline` is intrinsically linked to table environments like `tabular` and `array`, and its definition is primarily provided by the `array` package. If you encounter this error, the most common solution is to add `\usepackage{array}` to your document's preamble. While `\cline` is a fundamental command for drawing partial horizontal lines in tables, it's not part of the base LaTeX kernel in the same way `\begin{tabular}` is. Similarly, if you're using `longtable` for multi-page tables, `\usepackage{longtable}` is required, which also defines `\cline` within its scope. Ensure the appropriate package is loaded before `\begin{document}` to resolve the error and enable proper table formatting.

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