I am trying to deploy a destructive package, but I am receiving the following errors in test classes:
System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, OpportunityLineItemTriggers: execution of BeforeInsert caused by: System.NullPointerException: Attempt to de-reference a null object
System.DmlException: Update failed. First exception on row 0 with id 0067h00000BGr8vAAD; first error: INSUFFICIENT_ACCESS_ON_CROSS_REFERENCE_ENTITY, 0067h00000BGr8v: 
System.NullPointerException: Attempt to de-reference a null object
System.QueryException: List has no rows for assignment to SObject
P.s: these errors appeared in several test classes that were inserting and updating accounts, opportunities and users.