The error tells you that there are firmware functions missing on the ctrlX CORE. So probably you are using a feature, that is not implemented yet. Which version of the PLC app and ctrlX WORKS are you using?
See this thread for information about the alarm handling.
Please have a look to this thread for information what is needed to use the CodeSys WebVisu.
The CODESYS Web Visu is a partner app which requires a license. The licensing mechanism for CODESYS Add-Ons is not avilable on the virtual ctrlX CORE. Most likely this is the reason for the compiler error messages. Can you compile your program if you change the device to a real ctrlX CORE?