Our Opportunity Owners are very lazy at adding others to their Opportunity Team, and other Users who should often be added get frustrated since they are unable to add themselves. Any suggestions for workarounds for this? Best practice?

I am trying to update the Sample_QB_Error__c field with Hello
This code throws "an Invalid or unexpected token"  

Thanks

{!REQUIRESCRIPT("/soap/ajax/32.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/32.0/apex.js")} 
var record = new sforce.SObject("Opportunity"); 
record.Id = ‘{!Opportunity.Id}’; 
record.Sample_QB_Error__c ="Hello"; 
sforce.connection.update([record]); 
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