My url get like this if i have a crystal report in it

Question

I have a  domain purchased in some hosting environment www.planrbme.com.pk I have a simple application in which i have two pages one is simple WebForm1.aspx in that page i have a simple paragraph tag , and I have second page with name Default.aspx in which i have crystal report when i navigate to http://www.planrbme.com.pk/WebForm1.aspx it shows the content correctly , but when i navigate to http://www.planrbme.com.pk/Default.aspx then my Url become like that 

http://planrbme.com.pk/hello/login.aspx?ReturnUrl=%2fhello%2fDefault.aspx and it says the resource cannot be found ...

 

 

Why it is so any one can help me out why the url becomes like that on all pages having crystal report in them