Error in make.names(col.names, unique = TRUE) : invalid multibyte string at '<ca>14 <4a>ULY 2012'

I?m trying to read in the data below from an Excel file (as a .csv file) in  order to create an age (in years.%years) but am getting the error message in the subject line.

I?ve tried saving the dates as dates in Excel and tried saving the dates as text, both give me the same error message.  Can someone pls tell me what I?m doing wrong?

Gender	DOB	Diagnosis	Screen Date
Male	 14 JULY 2012	No	 05 OCTOBER 2015
Female	 31 OCTOBER 2009	No	 30 NOVEMBER 2015
Female	 08 JULY 2009	No	 06 DECEMBER 2015
Male	 04 JUNE 2011	NA	 11 JANUARY 2016
Female	 21 AUGUST 2009	Yes	 01 FEBRUARY 2016
Male	 05 NOVEMBER 2007	No	 16 FEBRUARY 2016
Male	 01 JUNE 2009	NA	 29 FEBRUARY 2016


 
Ken
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