diff --git a/0-cert.error b/0-cert.error
new file mode 100755
index 0000000..30f82c9
--- /dev/null
+++ b/0-cert.error
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+
+cat <<'EOF'
+
+-----------------------------------------------------------------------------------------
+
+*** On Error ***
+
+    Get https://hub.swarmlab.io:5480/v2/: x509: certificate
+    Pulling …
+    ERROR: Get https://hub.swarmlab.io:5480/v2/: x509: certificate signed by unknown authority
+
+*** run ***
+
+    ./0-get-certs.sh
+
+-----------------------------------------------------------------------------------------
+
+EOF
+echo $cat
diff --git a/build-intro.sh b/build-intro.sh
index ef988cd..42e991e 100755
--- a/build-intro.sh
+++ b/build-intro.sh
@@ -2,6 +2,9 @@ docker stop swarmlab-documentation
 docker container rm swarmlab-documentation
 docker pull hub.swarmlab.io:5480/antora 
 
+
+./0-cert.error
+
 docdir="intro"
 build="build-intro.sh"
 docker run -ti --name swarmlab-documentation -v $PWD/$docdir:/antora -v $PWD/supplemental-ui:/antora/supplemental-ui hub.swarmlab.io:5480/antora  /bin/sh -c "DOCSEARCH_ENABLED=true DOCSEARCH_ENGINE=lunr DOCSEARCH_INDEX_VERSION=latest NODE_PATH=/usr/local/lib/node_modules:\$NODE_PATH exec sh -c '/antora/run/$build'"