<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I got the following error when trying to build py39-nbconvert on a 2014 27” iMac running the latest version of Catalina (10.15.7). The error I got (from main.log) is the following:<div class=""><br class=""></div><div class="">:info:build Executing: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work/nbconvert-7.0.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 -m build --wheel --no-isolation --outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work <br class="">:debug:build system: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work/nbconvert-7.0.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 -m build --wheel --no-isolation --outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work <br class="">:info:build Failed to download css from <a href="https://unpkg.com/@jupyterlab/nbconvert-css@3.1.11/style/index.css:" class="">https://unpkg.com/@jupyterlab/nbconvert-css@3.1.11/style/index.css:</a> <urlopen error [Errno 64] Host is down><br class="">:info:build Failed to download css from <a href="https://unpkg.com/@jupyterlab/theme-light-extension@3.1.11/style/variables.css:" class="">https://unpkg.com/@jupyterlab/theme-light-extension@3.1.11/style/variables.css:</a> <urlopen error [Errno 64] Host is down><br class="">:info:build Failed to download css from <a href="https://unpkg.com/@jupyterlab/theme-dark-extension@3.1.11/style/variables.css:" class="">https://unpkg.com/@jupyterlab/theme-dark-extension@3.1.11/style/variables.css:</a> <urlopen error [Errno 64] Host is down><br class="">:info:build Failed to download css from <a href="https://cdn.jupyter.org/notebook/5.4.0/style/style.min.css:" class="">https://cdn.jupyter.org/notebook/5.4.0/style/style.min.css:</a> <urlopen error [Errno 64] Host is down></div><div class=""><br class=""></div><div class="">This error happens a few more times after that, and the build aborts with the following message:</div><div class=""><br class=""></div><div class="">:info:build raise OSError("Need CSS to proceed.")<br class="">:info:build OSError: Need CSS to proceed.<br class="">:info:build * Getting dependencies for wheel...<br class="">:info:build * Building wheel...<br class="">:info:build ERROR Backend subprocess exited when trying to invoke build_wheel<br class="">:info:build Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work/nbconvert-7.0.0" && /opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 -m build --wheel --no-isolation --outdir /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/work <br class="">:info:build Exit code: 1<br class="">:error:build Failed to build py39-nbconvert: command execution failed<br class="">:debug:build Error code: CHILDSTATUS 31665 1<br class="">:debug:build Backtrace: command execution failed<br class="">:debug:build while executing<br class="">:debug:build "system {*}$notty {*}$callback {*}$nice $fullcmdstring"<br class="">:debug:build invoked from within<br class="">:debug:build "command_exec -callback portprogress::target_progress_callback build"<br class="">:debug:build (procedure "portbuild::build_main" line 8)<br class="">:debug:build invoked from within<br class="">:debug:build "$procedure $targetname"<br class="">:error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_python_py-nbconvert/py39-nbconvert/main.log for details.</div><div class=""><br class=""></div><div class="">Any idea what the problem may be?</div><div class=""><br class=""></div><div class="">Thanks in advance,</div><div class=""><br class=""></div><div class="">Artemio</div><div class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><br class=""></div></div></div><div class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class="">Artemio Gonzalez Lopez</span></div></div></div></div><div class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 16px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><a href="mailto:artemiog@mac.com" class="">artemiog@mac.com</a></div>
</div>
<br class=""></body></html>