Vbscript: Err Object

On Error Resume Next
Err.Clear

REM Notice No Value passed in Set Method
Browser("Login | Salesforce").Page("Login | Salesforce").WebEdit("username").Set

Print  err.Number&" "&err.description
REM O/P: 450 Wrong number of arguments or invalid property assignment




On Error Resume Next
Err.Clear
REM Notice Value passed in not having " "
Browser("Login | Salesforce").Page("Login | Salesforce").WebEdit("username").Set x
Print  err.Number&" "&err.description
REM 0



On Error Resume Next
Err.Clear
REM Notice Value passed in not having " "
Browser("Login | Salesforce").Page("Login | Salesforce").WebEdit("username").Set  "x"
Print  err.Number&" "&err.description
REM 0