Read the statement by Michael Teeuw here.
MMM-CalDAV
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 @caw i am going to guess remove the dot in front of SYNOLOGY 
 and in the MagicMirror config mke sure there is a space where you see the 20, or make it %20one change at a time 
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 @sdetweil i dont have a dot in front of the Prefix module :“MMM-CalDAV”, 
 config: {
 servers: [
 {
 envPrefix: “SYNOLOGY_”,2024/09/06 01:23:15 stderr path: ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’ 
 2024/09/06 01:23:15 stderr syscall: ‘open’,
 2024/09/06 01:23:15 stderr code: ‘EACCES’,
 2024/09/06 01:23:15 stderr errno: -13,
 2024/09/06 01:23:15 stderr at async saveIcs (/opt/magic_mirror/modules/MMM-CalDAV/node_helper.js:76:7) {
 2024/09/06 01:23:15 stderr at async Object.writeFile (node:internal/fs/promises:1212:14)
 2024/09/06 01:23:15 stderr at async open (node:internal/fs/promises:639:25)
 2024/09/06 01:23:15 stderr [2024-09-06 01:23:15.709] [ERROR] Error: EACCES: permission denied, open ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’
 2024/09/06 01:23:15 stderr [2024-09-06 01:23:15.707] [ERROR] Whoops! There was an uncaught exception…2024/09/06 01:23:14 stderr at process.processTicksAndRejections (node:internal/process/task_queues:95:5) 
 2024/09/06 01:23:14 stderr at NodeHelper.checkFetchStatus (/opt/magic_mirror/js/node_helper.js:110:9)
 2024/09/06 01:23:14 stderr [2024-09-06 01:23:14.687] [ERROR] Calendar Error. Could not fetch calendar: http://localhost:8080/CALDAV/SYNOLOGY_Simon.ics Error: Not Found2024/09/06 01:23:14 stdout [2024-09-06 01:23:14.671] [LOG] [CALDAV] /opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics is not found. 2024/09/06 01:23:14 stdout [2024-09-06 01:23:14.606] [LOG] Create new calendarfetcher for url: http://localhost:8080/CALDAV/SYNOLOGY_Simon.ics - Interval: 3600000 
 2024/09/06 01:23:14 stdout [2024-09-06 01:23:14.539] [LOG] [CALDAV] Fetching SYNOLOGY_ : caldav …
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 @caw said in MMM-CalDAV: @sdetweil i dont have a dot in front of the Prefix module :“MMM-CalDAV”, 
 config: {
 servers: [
 {
 envPrefix: “SYNOLOGY_”,2024/09/06 01:23:15 stderr path: ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’ 
 2024/09/06 01:23:15 stderr syscall: ‘open’,
 2024/09/06 01:23:15 stderr code: ‘EACCES’,
 2024/09/06 01:23:15 stderr errno: -13,
 2024/09/06 01:23:15 stderr at async saveIcs (/opt/magic_mirror/modules/MMM-CalDAV/node_helper.js:76:7) {
 2024/09/06 01:23:15 stderr at async Object.writeFile (node:internal/fs/promises:1212:14)
 2024/09/06 01:23:15 stderr at async open (node:internal/fs/promises:639:25)
 2024/09/06 01:23:15 stderr [2024-09-06 01:23:15.709] [ERROR] Error: EACCES: permission denied, open ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’
 2024/09/06 01:23:15 stderr [2024-09-06 01:23:15.707] [ERROR] Whoops! There was an uncaught exception…i dont know what caldav wants in its setup, 
 sorry. you’ll have to wait for @MMRIZE to help
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 [ERROR] Error: EACCES: permission denied, open ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’ I’m not familiar with the Docker setting. Anyway, it seems to be a permission issue. The docker container creation and execution might be performed by different accounts. Or you may need proper permission for those files or directories. However, I have no idea of Docker environment, so that’s all I can say. 
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 [ERROR] Error: EACCES: permission denied, open ‘/opt/magic_mirror/modules/MMM-CalDAV/service/.SYNOLOGY_Simon.ics’ how did you start the container? Please provide full docker run ...command or compose file.
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 Hello, I am new and wondering what do you name the file env.example to? Second What lines need to be added to the /config/config.js file? 
 Thanks
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 @danny607 the env file name is typically 
 .envnote the leading dot the linux file systems do not have a flag for hidden, so by convention anything with a leading . (dot) will not be shown in file lists unless explicitly requested 
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 so looking at the code, this module will write out the constructed ICAL format data to const filePath = path.resolve(__dirname, 'service', '.' + fileName)notice the dot… in linux =by convention, file/folder names that start with dot are not shown unless explicitly requested… (making them hidden ‘most’ of the time SO, the code above is trying to USE a directory ‘service’ (part of this module repo) 
 in THIS module folder… but write to it…@karsten13 is the docker volume for where modules are located mapped read/write?? (the compose file doesn’t say) 
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 @sdetweil said in MMM-CalDAV: @karsten13 is the docker volume for where modules are located mapped read/write?? (the compose file doesn’t say) see docs rw: Read and write access. This is the default if none is specified.
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 @karsten13 thats what I thought @caw can you ssh logon to your synology and execute a docker command docker inspect magicmirrorscroll up to look at the mounts section 
 (this is from a different container, as I don’t have one running MM)Mounts": [ { "Type": "volume", "Name": "94f89b1076c681a8dd32a7863d7a867e2077849f0fc53091062aae3797433919", "Source": "/var/lib/docker/volumes/94f89b1076c681a8dd32a7863d7a867e2077849f0fc53091062aae3797433919/_data", "Destination": "/config", <---- check for /opt/magic_mirror/modules "Driver": "local", "Mode": "", "RW": true, <------------ check this , should be true "Propagation": "" },also, how (from where, as what userid?) did you git clone the module, and npm install? another docker command docker exec magicmirror ls /opt/magic_mirror/modules -laF 

