User475983607 posted
i have a web that has an error - it shows as a javascript popup cannot convert "" to double
how to i find the error in the page behind code?
Usually, these error have a lot more information like the line of code that caused the error unless you have custom error handlers.
Anyway, you must know what page you were accessing when the error popped up. So start with that page and look for code that converts a value to a double. If this is a custom error the do a find for the string "to double" or "cannot convert"
in the code behind.