Explain error with clusters

Signed-off-by: Sean Smith <seaam@amazon.com>

content/04-container-parallelcluster/04-launch-nextflow.md

@@ -94,5 +94,14 @@ The output of the job will be in the `nextflow_[SLURM_JOB_ID].out` file and simi
 ![Singularity run](/images/container-pc/singularity_nextflow.png)
 
 
+{{% notice warning  %}}
+There was a previous error with this tutorial that had the wrong github url
+`https://github.com/aws-samples/aws-hpc-tutorials/blob/isc22/static/scripts/post-install/container-install.sh`
+This was resolved in [#260](https://github.com/aws-samples/aws-hpc-tutorials/pull/260).
+If you hit this error you can debug it by looking at the **Logs** tab and looking at the **cloud-init-output** log of one of the compute nodes like so:
+![Logs Tab](/images/container-pc/pcm-logs.png)
+To resolve this, update the cluster to use the url `https://raw.githubusercontent.com/aws-samples/aws-hpc-tutorials/isc22/static/scripts/post-install/container-install.sh`
+{{% /notice %}}
+
 You have now run a basic genomics pipeline and you won't need the cluster in the next labs.
 The next section will go over how to delete your HPC Cluster.