@marchvet One of the easiest things to screw up within the config.js is the lack of commas. If you cut and paste a lot of the modules config.js suggested entries, they omit the last comma.
For example;
{ module: 'MMM-Multimonth', position: 'top_left' // can be any of the postions },See that comma at the end?
If you omit that, you’ll get the error screen if it’s not the last module in the list.
Even though it’s not “normal” - I put a comma even if it’s the last on every item. This eliminates that error.
As for the blank screens, the likely (but not always) module that’s missing is request. There’s documentation on how to install that elsewhere in the forum