Things to look out for if you’re migrating files from older to newer versions of UiPath
missing packages
uipath.core namespace
genfour.activities namespace
in the xaml replace <ua: tags with <ui:
in the xaml check for encoding=“{x:null}” (usually in read/write csv activities)
delete genfour.utitlies namespace (has an error sign)
install v7 compatability
resolve businessruleexception by adding the full path e.g. uipath.core.BusinessRuleException