http://www.jailbreakqa.com/questions/220883/calculatorappweatherapp-crash-fix
Install iFile from Cydia and open the file /var/mobile/Library/Caches/com.apple.mobile.installation.plist with the PropertyList editor.
Navigate to System -> com.apple.calculator and add a new key CodeInfoIdentifier, type String
set the value to the same as you see in CFBundleIdentifier, so for calculator this is com.apple.calculator
Same for weather: Navigate to System -> com.apple.weather and add key CodeInfoIdentifier (string) with com.apple.weather as value.
Reboot device and both apps should work again.
Install iFile from Cydia and open the file /var/mobile/Library/Caches/com.apple.mobile.installation.plist with the PropertyList editor.
Navigate to System -> com.apple.calculator and add a new key CodeInfoIdentifier, type String
set the value to the same as you see in CFBundleIdentifier, so for calculator this is com.apple.calculator
Same for weather: Navigate to System -> com.apple.weather and add key CodeInfoIdentifier (string) with com.apple.weather as value.
Reboot device and both apps should work again.