objective c - Can't draw completely using Open GL ES 2.0 in cocos 2d 2.0 in a game tutorial -

i working on tutorial http://www.raywenderlich.com/3888/how-to-create-a-game-like-tiny-wings-part-1 , trying hills correctly drawn. however, tutorial have been written before cocos 2.0 , therefore doesnt involve shaders. so, im trying convert it. far, have not succeeded , getting images these:

as can seen, doesn't draw hills , colors of hills wrong too. stops drawing them after 2 or 3 seconds. here part of code, draw them.

- (void) draw {      [self.shaderprogram use];     [self.shaderprogram setuniformformodelviewprojectionmatrix];      ccglblendfunc( cc_blend_src, cc_blend_dst );     ccglbindtexture2d(_stripes.texture.name);      glvertexattribpointer(kccvertexattrib_position, 2, gl_float, gl_false, 0, _hillvertices);     glenablevertexattribarray(kccvertexattrib_position);      glvertexattribpointer(kccvertexattrib_texcoords, 2, gl_float, gl_false, 0, _hilltexcoords);     glenablevertexattribarray(kccvertexattrib_texcoords);      gldrawarrays(gl_triangle_strip, 0, (glsizei)_nhillvertices); } 

if needed can share more of code. hoping have had problem before can me or suggest solution.

thanks