the 2 error messages indicate that the calculated measure(s) are incorrectly written.
MDXScript(Cube Name) (,14) The dimension ‘[LAST MONTH WITH DATA]’ was not found in the cube when the string, [LAST MONTH WITH DATA], was parsed.
As Chris Webb showed as an example when writting about the single quote, the "dimension was not found" message usually occurs when we put something (not a proper MDX expression) in the calculated measure, something like "with member measures.X as [here we go]" then SSAS would response with "The dimension [here we go] was not found in the cube when the string [here we go] was parsed". Alternatively it could also means what it says, i.e. that dimension is not in the cube (incorrect name perhaps?)
MDXScript(Cube Name), (735, 25) The hierarchy ‘[YearQuarterMonthDay]’ was not found in the cube when the string, [Date].[yearQuarterMonthDay].[Day and Month and Year], was parsed.
Check Date dimension, see if you have an attribute (or a hierarchy) called [YearQuarterMonthDay].