Cloud render on own DEM

[cmlosariaGIS]

Hi Tyler,

Thanks for making rayshader. I am playing around with it and plan to use it on my future projects.

I tried your sample script and DEM and it works fine. However, when i use my own DEM, it gives me an error when trying to render clouds

Script
elmat %>%
sphere_shade(texture = "imhof3") %>%
add_water(detect_water(elmat), color = "lightblue") %>%
add_shadow(cloud_shade(elmat, zscale = 10, start_altitude = 2000, end_altitude = 3000,), 0) %>%
plot_3d(elmat, zscale = 10, fov = 0, theta = 135, zoom = 0.75, phi = 45, windowsize = c(1200, 800),
background="Gray")
render_camera(theta = 20, phi=40,zoom= 0.64, fov= 56 )
render_label(elmat, x = 300, y = 270, z = 16000, zscale = 100,
text = "Fansipan", dashed = "False", offset = 4000, textsize = 1.5, linewidth = 0.75, textcolor = "white", linecolor = "white")
render_compass(position = "E")
render_scalebar(limits=c(0, 5, 10),label_unit = "km",position = "W", y=50,
scale_length = c(0.33,1))
Sys.sleep(0.2)
render_clouds(elmat, zscale = 10, start_altitude = 2000, end_altitude = 3000,
sun_altitude = 45, attenuation_coef = 2, offset_y = 300,
cloud_cover = 0.55, frequency = 0.01, scale_y=3, fractal_levels = 32, clear_clouds = T)
render_snapshot(clear=TRUE)

Error
Error in render_floating_overlay(generate_cloud_layer(heightmap, coef = attenuation_coef, :
If remove_na = TRUE, heightmap and overlay must have same number of rows and columns to make overlay transparent at those points

How can I fix this?