Server not starting

[dator]

I stumbled upon problem with running calibre server after I attempted to add some more libraries.

Below is the error I get when restarting server after changes were made

● calibre.service - Calibre Service
   Loaded: loaded (/lib/systemd/system/calibre.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2018-09-10 14:22:24 CEST; 22min ago
 Main PID: 8673 (code=exited, status=1/FAILURE)

Sep 10 14:22:23 vps systemd[1]: Started Calibre Service.
Sep 10 14:22:24 vps calibre-server[8673]: There is no calibre library at: /home/username/Library
Sep 10 14:22:24 vps systemd[1]: calibre.service: Main process exited, code=exited, status=1/FAILURE
Sep 10 14:22:24 vps systemd[1]: calibre.service: Unit entered failed state.
Sep 10 14:22:24 vps systemd[1]: calibre.service: Failed with result 'exit-code'.
Sep 10 14:25:20 vps systemd[1]: Stopped Calibre Service.
Sep 10 14:28:27 vps systemd[1]: [/lib/systemd/system/calibre.service:11] Missing '='.

My configuration

[Unit]
Description=Calibre Service
After=network.target

[Service]
Type=simple
User=username
Group=calibre

ExecStart=/usr/bin/calibre-server\
--max-opds-items=30\
--max-opds-ungrouped-items=100\
--port xxxx \
--log=/home/username/.calibre.log \
--enable-auth \
/home/username/Library1 \
/home/username/Library2 \
/home/username/Library3 \
/home/username/Library4 \
/home/username/Library5


[Install]
WantedBy=multi-user.target

It looks like calibre library called "Library" is missing. Strange as I didn't add library called like that or had it setup earlier either.

PS

I tried to resolve the issue few hours later since my last post and server seems to be working fine.

Still I am interested why it didn't work in the first place.