LyX ⇒ Tablenote in LyX environment

[amitk]

There are 3 packages for entering tablenotes in longtable: threeparttable, threeparttablex, and ctable. All these packages require entering latex code. It seems that the threeparttablex do not require entering code (exluding references to the notes) inside the table environment.
I tried (in TeX code environment)

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\begin{ThreePartTable} 
\begin{TableNotes} 
\item[a] \label{tn:a} coment text 
\end{TableNotes}

before the table

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\tnotex{tn:a}

in the table. And

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\end{ThreePartTable}

at the end of the table.

I'm keeping receiving an error: "File 'threeparttablex.sty' is not found"; and description: "\uspackage {hyperref} ***(cannot \read from terminal in nonstop modes)".
This is even though I istalled these packages and reconfigured LyX.

Anyone know what is the problem/solution?