Can't find element with HtmlFindExpression

[Anton]

Sometime Expressions doesn't work.

For example:

public static readonly HtmlFindExpression ProjectLabelInProjectsTree = new HtmlFindExpression("id=projectTree", "|", "class=rf-tr-nd-colps", "|", "class=rf-trn-cnt");
Find.ByExpression<HtmlSpan>(MainTestPageObjects.ProjectLabelInProjectsTree).Click();

<div id="projectTree" class="rf-tr">
<div id="projectTree:1st - Projects:j_idt43" class="rf-tr-nd rf-tr-nd-colps firefinder-match">
<div id="j_idt43" class="rf-trn firefinder-match">
<span class="rf-trn-hnd-colps rf-trn-hnd"></span>
<span class="rf-trn-cnt rf-trn-sel">
</div>
</div>
<div id="projectTree:2nd - Deploy Configurations:j_idt52" class="rf-tr-nd rf-tr-nd-lf rf-tr-nd-last">
<div id="j_idt52" class="rf-trn firefinder-match">
<span class="rf-trn-hnd-lf rf-trn-hnd"></span>
<span class="rf-trn-cnt">
</div>
</div>

code return exception - 

• • • • • System.NullReferenceException: Object reference not set to an instance of an object.

[Anton]

Sorry, it's duplicate.

answer here:

link