The same error for me: I was calling the name of the file, but I actually needed to call the name of the worksheet for my PROC CONTENTS:

libname np xlsx '/home/cmuir/pulse_export2.xlsx';
options validvarname=v7;
proc contents data=np._ALL_;
/* rt_top_kws and rt_top_kws2 are the excel tab names - I was trying to use np.pulse_export2 which gave the Error code=80001019 */
run;
libname np clear;