I got some server error message during the my web site development

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ASP.NET

i got this error message

webdev.webserver.exe has stopped working

during the my web site implementation.
but when i restart it is OK. but again it will occur.
im doing project like this.i ll explain using few steps(i ll explain this in user view and system view).then everyone can understand.

project name is leaf comparison

User view
step 1 -- user log in to the system and upload his leaf image.and it will show in image view1
step 2 -- then web site upload that image and redirect it to edit leaf image page.
step 3 -- user can change brightness and image size and also he can crop image.
step 4 -- after editing his image then he can click crop button.then image shown in image view2
step 5 -- if user is satisfied the image that shown in image view2 he can click get answer button
step 8 -- system give correct answer.

System view

step 6 -- system convert leaf using canny edge algorithm
step 7 -- system compare that canny image with system template images.
step 8 -- then system can get good accuracy answer and he'll return the answer

[in my project i'm comparing my image by converting canny image.but in here it doesn't affect to the error.there is template images that uploaded by admin.those images also getting converted.then i can compare admin uploaded images(template images) with user uploaded images.]


steps that occur my problem

step 3 ---- some times it give error in this step
step 4 ---- most of time in this step i got above early mentioned error.

i don't know what happend.because when i restart my system and edit image that early error occurred,then it is ok.
but most of time it will give the error.
i hope u can understand my problem.

i rebuild my project most of times.
i checked my code has any infinite loops.but i cannot find there is any infinite loop problem

please guys help me for solve this problem