# ask-community

Caelan Schneider

02/15/2024, 2:53 PM
Is it possible to configure an IO Manager at launch time like you can with a Resource? In theory this should make sense because an IO Manager is a Resource, and configure_at_launch() is an available method of ConfigurableIOManager and ConfigurableIOManagerFactory. However, when I call MyIOManager.configure_at_launch() in my definitions object, I get an error:
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dagster._check.ParameterCheckError: Invariant violation for parameter default_value. Description: default_value cannot be a callable
EDIT: I actually think this may be a more esoteric error specific to my IO Manager implementation, not caused by configure_at_launch() specifically, though that's what the stack trace suggests.