Setting VarChar Variable with String Parameter in Crystal Report Add Command

Setting a VarChar Variable with a String Parameter in a Crystal Report 2008 SP6.3 Add Command is causing an error with a SQL State of 42000.  The Error Code depends on which value I select for the parameter.  I created the @DateOpt string parameter in the Modify Command window, not in the report. If I comment out line 14 of the SQL the error does not occur.

I have attached the SQL Code and screen shots of the errors.   Please tell me what I am doing wrong.