Custom Workflow

@"< fetch version = '1.0' output - format = 'xml-platform' mapping = 'logical' distinct = 'false' > " + " < entity name = 'contact' > " + " < filter type = 'and' > " + " < condition attribute = 'crc66_account' operator= 'eq' value = '" + entityId + "' /> " + " </ filter > " + " </ entity > " + " </ fetch > "

I am passing this fetchXML to the workflow input and get geting Invalid XML error.

String Contacts = this.InputText.Get<String>(context);
//throw new InvalidPluginExecutionException(Contacts);
string fetchquery = string.Format(Contacts);

this is my custom workflow code 

please help me to solve this error.