rex's static google map and geolocation problem

hi there, i would like to use geolocation with rex's static google map canvas,more specific i want to set the *center* of the static map the same as my real time coordinates(by clicking on a button) but wherever i try,I get an error,here's an image with the coding

https://ibb.co/fmQHC5

and here's the error

https://ibb.co/bGhEs5

thanks again for all the support