These glib errors are not really helpful, but I would guess it is some plugin or other library which are used by fcamera, which produces this error. I would say it is not fcamera or the driver itself. So recompiling these packages could help and would be the next step. Could you list the packages which you have in mind?

To get a clue and track down what cause this error you need to debug the application with gdb.

To get a break at the glib critical error use gdb like described here.

You need to install gdb on the device and propably the related debug packages of the packages which are used/linked by fcamera.

The journey continues, don't give up.