Runaway argument with linguex

Question

Compiling some linguex code gives me:

Runaway argument?
\newgll  [CP Ceapann tú [CP go bhuailfidh an píobaire an t-amhrán \ETC.
! File ended while scanning use of \ai.
<inserted text> 
                \par 

Code:

\documentclass[11pt]{article}
\usepackage{linguex}

\begin{document}
\ex. \aig. [CP Ceapann tú [CP go bhuailfidh an píobaire an t-amhrán ]] \\
          think you that play.FUT the piper the song\\
          `You think that the piper will play the song.'\\
 \big. An t-ór seo$_i$ [CP a$_N$ chreid corr-dhuine [CP go raibh sé$_i$ ann ] ].\\
       the gold DEM that.RSMP thought some-people that was it there\\
       `This gold that some people thought was there'\\

\end{document}

Answer 1

You need an empty line after every \ex.. The following works fine (apart from an underfull \hbox):

\documentclass[11pt]{article}
\usepackage{linguex}

\begin{document}
\ex. \aig. [CP Ceapann tú [CP go bhuailfidh an píobaire an t-amhrán ]] \\
          think you that play.FUT the piper the song\\
          `You think that the piper will play the song.'\\

\end{document}

Page 1 of the linguex documentation:

The list environment created by \ex. must be closed by a single blank line (a \par). The text following this list will not be indented. In order to get a \parindent, a second blank line must be added, immediately following the first.