Error when including widget weeloop/spaceTop

[WIDGET] unable to evaluate contextual xpath {concat($space/space/firstName, ' ', $space/space/lastName)}

• Class : com.seemy.common.widget.output.SeeMyOutputter
• Method : evaluateContextualXPath
• File : SeeMyOutputter.java
• Line : 754

Illegal group reference

• Class : java.util.regex.Matcher
• Method : appendReplacement
• File : Matcher.java
• Line : 713