NSURL not getting allocatd with NSString

This' strange because all my other NSUrls in program are working properly but this one isn't getting allocated with NSString. I'm using:

urlStr_ = [NSString stringWithFormat:@"http://192.168.10.2/justmeans/trunk/appaddgoodwork?gencode=%@&deviceid=@%@&sessionkey=%@&a开发者_高级运维mp;userid=%@&updatetext=%@&companyid=%d&service_type=%@",securitycode,deviceId,sessionKey,userId,finalTextInTxtVw,companyId,service_type];
urlStr_ = [urlStr_ stringByAddingPercentEscapesUsingEncoding:(NSStringEncoding)NSUTF8StringEncoding];

url_ = [[NSURL alloc] initWithString:urlStr_];

What are the possible reasons for NSUrl not getting allocated? Can anybody please help?

Thanx in advance.

P.S. NSString is not empty.

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Useally it is because the string is not formatted correctly for encoding as an URL. Try to chop of bits of the string to find the offending part.

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The string seems to not be correctly formatted. See the %@&deviceid=@%@&sessionkey part; should not it be %@&deviceid=%@&sessionkey?