Error in ACT and sometimes even in code running

Hello,

i have ACT on my web application and it is working well... but now if i add any control of ACT it shows me error for example i have CalendarExtender in a page running fine. but now now i want to add to another page it shows me errors!!

link is the screenshot of my error https://1drv.ms/u/s!ArxL2goPTnKqpO9gOB70sel4zpxiGQ