# \[FAQ\] put\_vaddr\_frames \[/var/lib/dkms/furiosa-driver-rngd/../build/src/rngd\_pdma.ko\] undefined! **URL:** \ **Category:** Firmware & Driver\ **Tags:** faq\ **Created:** [March 3, 2025, 5:43pm UTC](https://forums.furiosa.ai/t/faq-put-vaddr-frames-var-lib-dkms-furiosa-driver-rngd-build-src-rngd-pdma-ko-undefined/261 "2025-03-03T17:43:34Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![hyunsik](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.furiosa.ai/hyunsik/32/6_2.png) [@hyunsik](https://forums.furiosa.ai/u/hyunsik)\ **Post date:** [March 3, 2025, 5:43pm UTC](https://forums.furiosa.ai/t/faq-put-vaddr-frames-var-lib-dkms-furiosa-driver-rngd-build-src-rngd-pdma-ko-undefined/261/1 "2025-03-03T17:43:34Z")
## Question The following error can happen in some environment. How do I fix this error? ```auto ERROR: modpost: "put_vaddr_frames" [/var/lib/dkms/furiosa-driver-rngd/2025.1.0-2/build/src/rngd_pdma.ko] undefined! ERROR: modpost: "get_vaddr_frames" [/var/lib/dkms/furiosa-driver-rngd/2025.1.0-2/build/src/rngd_pdma.ko] undefined! ERROR: modpost: "frame_vector_destroy" [/var/lib/dkms/furiosa-driver-rngd/2025.1.0-2/build/src/rngd_pdma.ko] undefined! ERROR: modpost: "frame_vector_create" [/var/lib/dkms/furiosa-driver-rngd/2025.1.0-2/build/src/rngd_pdma.ko] undefined! ERROR: modpost: "frame_vector_to_pages" [/var/lib/dkms/furiosa-driver-rngd/2025.1.0-2/build/src/rngd_pdma.ko] undefined! ``` ## Answer The above error can occur if there’s no linux-headers and no linux-modules-extra for dkms module you tried to build. Please install as follows: ```auto sudo apt install build-essential linux-modules-extra-$(uname -r) linux-headers-$(uname -r) ``` See Also: [https://developer.furiosa.ai/latest/en/getting\_started/prerequisites.html#installing-prerequisite-packages](https://developer.furiosa.ai/latest/en/getting_started/prerequisites.html#installing-prerequisite-packages)