CoreImage: EAGLContext framebuffer or renderbuffer incorrectly configured!

gistfile1.txt

- (void)drawCIImage:(CIImage *)image
{
	CGRect rect = [image extent];

	// http://stackoverflow.com/questions/8778117/video-filtering-in-iphone-is-slow
	
	GLuint _renderBuffer;
	CGContextRef cgContext;
	CIContext *coreImageContext;
	
	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
	
    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * rect.size.width;
    NSUInteger bitsPerComponent = 8;
    cgContext = CGBitmapContextCreate(NULL, rect.size.width, rect.size.height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast);
    CGColorSpaceRelease(colorSpace);
	

	EAGLContext *glContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
	
	coreImageContext = [CIContext contextWithEAGLContext:glContext];
	
    glGenRenderbuffers(1, &_renderBuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer);

	[EAGLContext setCurrentContext:glContext];
	[coreImageContext drawImage:image atPoint:CGPointZero fromRect:rect];
}