Hello @Community Alums 

for the first read error, you have to create a read cross scope access previllige record for Employee Center core

you can refer this to create one: https://docs.servicenow.com/bundle/xanadu-application-development/page/build/applications/task/set-R...

for the second and third errors, the error is coming from Employee Center Header widget. You have to debug the code in that widget to know from where this error is coming from.

Please mark the answer as helpful and correct if helped 

Kind Regards,

Ravi Chandra