Hi all

I am trying to convert Latex code to Mathematica by using the example: ToExpression["\\sqrt{x y}", TeXForm]. I came across a problem of "non-math mode":

The code I put into Mathematica is as below:

ToExpression["\\lbrace 1- \\Phi [({{\\Sigma}_{22} - \

{{\\Sigma}_{12}})*(-{X}_{4}* {\\beta}_{4} - {\\Sigma}_{21}*\\(\\left(

\\begin{array}{c}

{\\varepsilon}_{1} \\\\

{\\varepsilon}_{2}

\\end{array}

\\right)\\))]\\rbrace*\\phi({\\varepsilon}_{1} , \

{\\varepsilon}_{2})*(1-\\alpha_{1}\\alpha_{31})", TeXForm]

The error info is:

Import::texerr: Error: Math primitive \delimiter in non-math mode.

How can I solve this problem?

Thanks a lot !