r-image example docker build failed

> => ERROR [5/6] RUN conda install --quiet --yes 'r-base=4.0.0' 'r-caret=6.*' 'r-crayon=1.3*' 'r-devtools=2.3*' 'r-forecast= 83.8s
> ------
> > [5/6] RUN conda install --quiet --yes 'r-base=4.0.0' 'r-caret=6.*' 'r-crayon=1.3*' 'r-devtools=2.3*' 'r-forecast=8.12*' 'r-hexbin=1.28*' 'r-htmltools=0.4*' 'r-htmlwidgets=1.5*' 'r-irkernel=1.1*' 'r-rmarkdown=2.2*' 'r-rodbc=1.3*' 'r-rsqlite=2.2*' 'r-shiny=1.4*' 'r-tidyverse=1.3*' 'unixodbc=2.3.*' 'r-tidymodels=0.1*' 'r-reticulate=1.*' && pip install --quiet --no-cache-dir 'boto3>1.0<2.0' 'sagemaker>2.0<3.0' && conda clean --all -f -y:
> #9 1.425 Collecting package metadata (current_repodata.json): ...working... done
> #9 11.72 Solving environment: ...working... failed with initial frozen solve. Retrying with flexible solve.
> #9 11.73 Collecting package metadata (repodata.json): ...working... done
> #9 57.83 Solving environment: ...working... Killed
> ------
> executor failed running [/bin/sh -c conda install --quiet --yes 'r-base=4.0.0' 'r-caret=6.*' 'r-crayon=1.3*' 'r-devtools=2.3*' 'r-forecast=8.12*' 'r-hexbin=1.28*' 'r-htmltools=0.4*' 'r-htmlwidgets=1.5*' 'r-irkernel=1.1*' 'r-rmarkdown=2.2*' 'r-rodbc=1.3*' 'r-rsqlite=2.2*' 'r-shiny=1.4*' 'r-tidyverse=1.3*' 'unixodbc=2.3.*' 'r-tidymodels=0.1*' 'r-reticulate=1.*' && pip install --quiet --no-cache-dir 'boto3>1.0<2.0' 'sagemaker>2.0<3.0' && conda clean --all -f -y]: exit code: 137

As stated, image build failed. Here's the log of docker build step.