I get the same the same error, any kind of advices?
http://www.google.com/search?hl=en&q=site:modxcms.com/forums+-print+-wap2+-dlattach+No+foreign+key+definition+for+parentClass&aq=f&aqi=&aql=&oq=
http://modxcms.com/forums/index.php/topic,40352.msg243519.html#msg243519
Is Wayfinder installed correct?
http://www.google.com/search?hl=en&q=site:modxcms.com/forums+-print+-wap2+-dlattach+Could+not+install+related+objects+for+vehicle+object+&aq=f&aqi=&aql=&oq=
Is Quip installed correct?
Same here - with 2.0.8-pl.
Other extras downloaded and installed fine - the following did not:
Essentials for blogging
modx Sample Site