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JavaScript - http://www.bookean.ru/registration/
Event thread: change
Error:
name: TypeError
message: Statement on line 10: Cannot convert undefined or null to Object
stacktrace:   Line 10 of linked script http://www.bookean.ru/js/jslib.axd?d=bookean.common.js&v=2: In function checkEmailExistInDB
    else{ShowUpdatePopup();Bookean.Web.Services.AuthenticationService.IsLoginExists($get(EmailTbClientID).value,checkEmailComplete,checkEmailFailed,true);}}}
  Line 1 of eval script 
    checkEmailExistInDB(EmailTbClientID, 'EmlReqTrueImg');(val, args) ;
  Line 458 of linked script http://www.bookean.ru/ScriptResource.axd?d=I_VIBTGAp7jlqtJ2blg8HjdvcHp1kVEw7kofyL9hnJ6PnGV_Ebw5wtXEZtka-vXVFJqTaqZiBRbHDMOwrCG84Q2&t=514e1130: In function CustomValidatorEvaluateIsValid
            eval(val.clientvalidationfunction + "(val, args) ;");
  Line 208 of linked script http://www.bookean.ru/ScriptResource.axd?d=I_VIBTGAp7jlqtJ2blg8HjdvcHp1kVEw7kofyL9hnJ6PnGV_Ebw5wtXEZtka-vXVFJqTaqZiBRbHDMOwrCG84Q2&t=514e1130: In function ValidatorValidate
                val.isvalid = val.evaluationfunction(val);
  Line 173 of linked script http://www.bookean.ru/ScriptResource.axd?d=I_VIBTGAp7jlqtJ2blg8HjdvcHp1kVEw7kofyL9hnJ6PnGV_Ebw5wtXEZtka-vXVFJqTaqZiBRbHDMOwrCG84Q2&t=514e1130: In function ValidatorOnChange
            ValidatorValidate(vals[i], null, event);
  Line 2 of eval script 
    ){ValidatorOnChange(event);  
  ...

Bookean.Web.Services.AuthenticationService is undefined
http://www.bookean.ru/js/jslib.axd?d=bookean.common.js&v=2
Line 10

checkEmailExistInDB("ctl00_ctl00_ctl00_PageView_PageView_phDefault_RegisterNewUserControl_UserName", "EmlReqTrueImg")jslib.ax...on.js&v=2 (line 10)
eval()ScriptRe...al/seq/11 (line 1)
CustomValidatorEvaluateIsValid(span#ctl00_ctl00_ctl00_PageView_PageView_phDefault_RegisterNewUserControl_emailCustomVldr)ScriptRe...=514e1130 (line 458)
ValidatorValidate(span#ctl00_ctl00_ctl00_PageView_PageView_phDefault_RegisterNewUserControl_emailCustomVldr, Object name=validationGroup, change )ScriptRe...=514e1130 (line 208)
ValidatorOnChange(change )ScriptRe...=514e1130 (line 173)
anonymous(change )ScriptRe...val/seq/5 (line -1)
[Break on this error] else{ShowUpdatePopup();Bookean.Web.Servi...mailComplete,checkEmailFailed,true);}}}\n