Web服务方法 - 不从try catch块中找到的if else语句返回数据

I have a web service method to compare templates, however it does not perform the code in the if else statement found in the try catch block instead it returns the last return statment which says "error". Any idea what am doing wrong? It was supposed to return "finger was verified" or "finger was NOT verified".I have a web service method to compare template