Problem to view second page Crystal Reports using asp.net c#

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CrystalReports

hello,

i have a report of two pages . first i had a problem to get the second page , then i added a section(DetailSection b) to the "details section" , on the Section Expert.. i selected "new page after" and it works , in the "main report preview" i can see my first and second page normally

BUT the problem is when executing the project and clicking on "Display report" button only the first page appear ,
when i click "next page" i get this ***Aucune source de rapport valide n'est disponible****
that means No valid report source is available

please i'm missing something??

ps: i put what i want to display on the second page in "DetailSection b"
thnx