General ⇒ Would you please explain an error when buiding a file?

[alwayssmile68]

When I build a file, the following is produced. I have no idea of this kind of error. Please interpret it. Thanks.
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Latex font warning: Font shape `OT1/cmss/m/it' in size <10> not available.
(font) font shape `OT1/cmss/m/s1' tried instead on input line 56.
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The following is the said original input line:

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\item ev\[~e_1:E \textit{op}:Op ~e_2: E\](sto, env) \=
= ev \[~e_1\](sto, env) + ev \[~e_2\](sto, env) \quad if \textit{op} = + \=
\textit{or} \=
= ev \[~e_1\](sto, env) $-$ ev \[~e_2\](sto, env) \quad if \textit{op} = $-$ \=
\textit{or} \=
\ldots

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[ptoche]

the requested font is missing, so a substitute was used.

I'm no expert on this, but try some of the possibilities below (in the preamble), it might fix it.

\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{lmodern}
%\usepackage[english]{babel}
%\usepackage{pslatex}%obsolete, use mathptmx or helvet-scaled
\usepackage[scaled=.90]{helvet}
%\usepackage{times,mathptmx}
\usepackage{textcomp}
%\usepackage{cmbright}

[Stefan Kottwitz]

Hi,

this problem was also discussed here, there's an explanation of this error and a description to fix it.

Stefan