Error

WebL exception: [. "msg" = "incompatible operands for + operator", "type" = "OperandMismatch", "line" = 57 .]
at line 57
while evaluating ((((((("

	
	
        
        
        				
		
		
	
	
	

		

" + Markup(WubCall("collabSidebar", []))) + "        
		

		


		

			

        
") + header) + "
 

	
	


        
  
") + reqinfo) + "
  
        
  
") + content)

Variables in context:
   11  footer: string="
Command: collaborama.collaborama
Generated by Collaborama (v. 0.6m)
"
   10  header: string="



  login]"
   8  cmdinfo: string="Command: collaborama.collaborama"
   7  reqinfo: string="Source: collaborama.collaborama [edit]"
   6  WubEval: fun=
   5  WubCall: fun=
   4  wubvars: nil=nil
   3  wubinfo: object=[. "wubversion" = "0.6m", "weblversion" = "webl-3.1.4b", "googlemapkey" = "ABQIAAAAjxuoc0eLTk1WT-9jKMP_9xRXRHt4M-rxIPBKqsbHmJu00...
   2  EXTRAARGS: nil=nil
   1  OPTIONALARGS: list=[]
   0  content: list=["
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