ShEx experts, 

I've got https://www.wikidata.org/wiki/EntitySchema:E126 mostly working now thanks to the examples and note on  https://www.wikidata.org/wiki/Wikidata:WikiProject_ShEx/How_to_get_started%3F  
specifically about
N.B. E97 only makes sure that an item has at least one class. The constraint that at least one class is an organization (Q43229) or a subclass of (P279) organization (Q43229) requires a more complex recursive definition and is found here and in E98.
 
Would love some help about the cardinality errors I'm getting when using E126 with example query or any of the other example queries in comments in E126 :

 SELECT ?winner WHERE {
  ?winner wdt:P166 ?prize.
  ?prize (wdt:P361|wdt:P31|wdt:P279) wd:Q7191.
 }

Errors from ShEx2 Online Validator :

✗wd:Q106471@!START

Thad