The ornamental design for an erosionbarrier, as shown and described.
FIG. 1 is a front perspective view of the erosion barrier;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a rear view thereof.
Features shown in broken lines do not form any part of the claimed design. Any broken lines immediately adjacent the solid-line portions of the design form the boundary of the design, with the broken lines forming no part of the claimed design.