working on setting gtm_id which is getting from api call. using 1.5.3 and also 1.5.0 but still, get the same error for setting configuration. For more details check the below image. 
working on setting gtm_id which is getting from api call.
using 1.5.3 and also 1.5.0 but still, get the same error for setting configuration.
For more details check the below image.
