diff --git a/pytorch3d/implicitron/models/metrics.py b/pytorch3d/implicitron/models/metrics.py
index cc44a518..13387609 100644
--- a/pytorch3d/implicitron/models/metrics.py
+++ b/pytorch3d/implicitron/models/metrics.py
@@ -362,6 +362,11 @@ class ViewMetrics(ViewMetricsBase):
 
 def _rgb_metrics(images, images_pred, masks, masks_pred, masks_crop):
     assert masks_crop is not None
+    if images.shape[1] != images_pred.shape[1]:
+        raise ValueError(
+            f"Network output's RGB images had {images_pred.shape[1]} "
+            f"channels. {images.shape[1]} expected."
+        )
     rgb_squared = ((images_pred - images) ** 2).mean(dim=1, keepdim=True)
     rgb_loss = utils.huber(rgb_squared, scaling=0.03)
     crop_mass = masks_crop.sum().clamp(1.0)
diff --git a/pytorch3d/renderer/implicit/raymarching.py b/pytorch3d/renderer/implicit/raymarching.py
index 1f3ca9ba..195b6aa6 100644
--- a/pytorch3d/renderer/implicit/raymarching.py
+++ b/pytorch3d/renderer/implicit/raymarching.py
@@ -215,6 +215,7 @@ def _check_raymarcher_inputs(
     if density_1d and rays_densities.shape[-1] != 1:
         raise ValueError(
             "The size of the last dimension of rays_densities has to be one."
+            + f" Got shape {rays_densities.shape}."
         )
 
     rays_shape = rays_densities.shape[:-1]