Error message shows <nil> when trying to compile in-cluster module

apiVersion: kmm.sigs.k8s.io/v1alpha1
kind: Module
metadata:
  name: simple-oot
spec:
  driverContainer:
    name: overwritten-anyway
    command: [sleep, infinity]
    imagePullPolicy: Always
    lifecycle:
      postStart:
        exec:
          command: [modprobe, -avd, /opt, simple-kmod, simple-procfs-kmod]
      preStop:
        exec:
          command: [modprobe, -arvd, /opt, simple-kmod, simple-procfs-kmod]
    securityContext:
       privileged: true
    #  capabilities:
    #    add:
    #      - all
  kernelMappings:
    - literal: 4.18.0-305.49.1.el8_4.x86_64
      containerImage: quay.io/yshnaidm/simple-kmod:4.10.18
    - literal: 4.18.0-372.19.1.el8_6.x86_64
      containerImage: quay.io/ukalifon/simple-kmod:4.11.0-build
      build:
        buildArgs:
          - name: KVER
            value: 4.18.0-372.19.1.el8_6.x86_64
          - name: KMODVER
            value: 0.0.1
        secrets:
          - name: build-secret
        dockerfile: |
                FROM quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:514e256367e8707e2c30f18a4f06fbd6c821ab9776602d2488e861f577a357d0
                WORKDIR /build/
                RUN git clone https://github.com/openshift-psap/simple-kmod.git && \
                    cd simple-kmod && \
                    make all       KVER=${KVER} KMODVER=${KMODVER} && \
                    make install   KVER=${KVER} KMODVER=${KMODVER} && \
                    mkdir -p /opt/lib/modules/${KVER} && \
                    cp /lib/modules/${KVER}/simple-*.ko /lib/modules/${KVER}/modules.* /opt/lib/modules/${KVER}

  selector:
    wants-oot-module: ooto_simple_kmod 

oc create secret docker-registry build-secret --docker-server=quay.io --docker-username=ukalifon --docker-password=I3U74MF...

E0815 10:09:03.411807       1 controller.go:326]  "msg"="Reconciler error" "error"="failed to handle build for kernel version 4.18.0-372.19.1.el8_6.x86_64: could not synchronize the build: job failed: <nil>" "controller"="module" "controllerGroup"="kmm.sigs.k8s.io" "controllerKind"="Module" "module"={"name":"simple-oot","namespace":"simple-oot"} "name"="simple-oot" "namespace"="simple-oot" "reconcileID"="c276efd4-9f63-4060-975f-0c8a4f30fe0e"