# Error-\[NOA\] Null object access **URL:** \ **Category:** UVM\ **Tags:** systemverilog-uvm, UVMF, UVM, uvm\_config\_db\ **Created:** [April 7, 2022, 1:09pm UTC](https://verificationacademy.com/forums/t/error-noa-null-object-access/40250 "2022-04-07T13:09:24Z")\ **Posts on this page:** 1\ **Showing post:** 15
**Author:** ![bob\_oden](https://verificationacademy.com/forums/letter_avatar_proxy/v4/letter/b/eb8c5e/32.png) [@bob\_oden](https://verificationacademy.com/forums/u/bob_oden)\ **Post date:** [April 7, 2022, 10:24pm UTC](https://verificationacademy.com/forums/t/error-noa-null-object-access/40250/15 "2022-04-07T22:24:57Z")
_In reply to [Rogers](https://verificationacademy.com/forums/t/error-noa-null-object-access/40250/14):_ This message: UVM\_FATAL /local\_vol1\_nobackup/user/vesutrav/mdm\_to\_uvmf\_4.0/out.er/linux\_3.10.0\_64/base/library/uvd-base/pub/src/verif/uvc/comp/uvmf/base/src/uvmf\_driver\_base.svh(95) @ 0.000 ns: sdb\_tb\_hevc\_decoder\_test.mdm\_agent\_h.mdm\_agent\_h\_driver [DRV] BFM handle with interface\_name is null simctrl: \*I: Line matched standard error regex ^\t Indicates that the interface\_name variable inside the agent configuration is null. The interface\_name variable is initialized using the initialize function of the agents configuration object. The interface\_name variable is used as the field\_name argument of uvm\_config\_db::get calls. The interface\_name variable value is automatically set and assigned if you are using the UVMF generator to create the interface, environment, and test bench. If you are using the UVMF generator to create the interface, environment, and test bench then the generated code will simulate without modification. If the generated code does not compile, optimize, and run then you have an error in the YAML used to describe the interface, environment, or bench. --- _[View the full topic](https://verificationacademy.com/forums/t/error-noa-null-object-access/40250)._