# {longtable} Package array Error: Illegal pream-token (1): c' used. [closed]

I'm new to Latex and really learning the nuances as I go.

My document was compiling fine, until all of a sudden, it wasn't. I'm using the {longtable} command. I get the following error message:

Package array Error: Illegal pream-token (1): c' used. ...}{Here, we are inputting g(x) into f(x).}


at this point in my code:

& & \multicolumn{1}{l}{Here, we are inputting g(x) into f(x).} \\


My code as a whole looks something like:

\usepackage{longtable}
\usepackage{pbox}
\usepackage{array}
\usepackage[margin=1in]{geometry}
...other stuff....
\begin{center}
\begin{longtable}{ m{4.5em}|c|c }
...table stuff...
& & \\
& & \multicolumn{1}{l}{Here, we are inputting g(x) into f(x).} \\


Again, it was working perfectly fine, but then suddenly it started flagging errors out of seemingly nowhere.

What is Latex trying to tell me?

• In the code fragment you show have used l for left alignment but the error message says you had used 1 (one) by mistake. – David Carlisle Oct 14 '15 at 7:58
• unreleated but are you sure that shouldn't be $g(x)$ into $f(x)$ ? – David Carlisle Oct 14 '15 at 7:59
• @DavidCarlisle Answer or close? – Torbjørn T. Nov 7 '15 at 22:12
• @TorbjørnT. close, just typo (I voted) – David Carlisle Nov 7 '15 at 23:06
• I'm voting to close this question as off-topic because simple 1/l typo – David Carlisle Nov 7 '15 at 23:07