Illegal use of reserved keyword "else".

if ( found )
 [r, pclon, pclat] = cspice_reclat( point );
 % Let re, rp, and f be the satellite's longer equatorial
 % radius, polar radius, and flattening factor.
 re = radii(1);
 rp = radii(3);
 f = ( re - rp ) / re;
 [pdlon, pdlat, alt] = cspice_recgeo( point, re, f );
 % Compute illumination angles at the surface point.
 [phase, solar, emissn] = cspice_illum( satnm, et, ABCORR, scnm, point );
 % Display results. Convert angles from radians to degrees
 % for output.
  fprintf( 'Intercept planetocentric longitude (deg): %11.6f\n',... R2D*pclon )
  fprintf( 'Intercept planetocentric latitude (deg): %11.6f\n',... R2D*pclat )
  fprintf( 'Intercept planetodetic longitude (deg): %11.6f\n',... R2D*pdlon )
  fprintf( 'Intercept planetodetic latitude (deg): %11.6f\n',...  R2D*pdlat )
  fprintf( 'Range from spacecraft to intercept point (km): %11.6f\n',... dist )
  fprintf( 'Range from spacecraft to target center (km): %11.6f\n',...  norm(obspos) )
  fprintf( 'Intercept phase angle (deg): %11.6f\n',... R2D*phase )
  fprintf( 'Intercept solar incidence angle (deg): %11.6f\n',... R2D*solar )
  fprintf( 'Intercept emission angle (deg): %11.6f\n',... R2D*emissn )
  else
  disp( ['No intercept point found at ' time ] )
  end

Answer 1

[Guillaume]

Short answer: get rid of all the ...

Long answer: I assume that at some point, the stuff after the ... was on a second line. ... means two things: the rest of the line is a comment, the remaining of the instruction is on the next line. In effect, what you have written is:

fprintf('something', fprintf('somethingelse', fprintf('anothersomething', else

else is not valid in this context.