Need help deciphering Jexl's error message

[Mikhail T.]

I have a fairly hairy expression, which is passed to jexl after substituting the 
variables. JMeter is happy, but jexl complains:

jmeter.functions.JexlFunction: An error occurred while evaluating the expression 
"("default" == "tablet" && "200" != "") ? "200" : "200""
 org.apache.commons.jexl.parser.ParseException: *Lexical error at line 1, 
column 40.  Encountered: "?" (63), after : ""*
        at 
org.apache.commons.jexl.ScriptFactory.createNewScript(ScriptFactory.java:164)
        at 
org.apache.commons.jexl.ScriptFactory.createScript(ScriptFactory.java:99)

What's wrong with the ternary operator? Jexl's syntax reference 
<http://commons.apache.org/jexl/reference/syntax.html> describes it... Thank you!

   -mi