diff --git a/keyserver/src/responders/landing-handler.js b/keyserver/src/responders/landing-handler.js
--- a/keyserver/src/responders/landing-handler.js
+++ b/keyserver/src/responders/landing-handler.js
@@ -85,7 +85,8 @@
       `,
     }: AssetInfo);
     return assetInfo;
-  } catch {
+  } catch (e) {
+    console.warn(e);
     throw new Error(
       'Could not load manifest.json for landing build. ' +
         'Did you forget to run `yarn dev` in the landing folder?',
@@ -104,7 +105,8 @@
     const webpackBuild = await import('landing/dist/landing.build.cjs');
     webpackCompiledRootComponent = webpackBuild.landing.default;
     return webpackCompiledRootComponent;
-  } catch {
+  } catch (e) {
+    console.warn(e);
     throw new Error(
       'Could not load landing.build.cjs. ' +
         'Did you forget to run `yarn dev` in the landing folder?',
diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -88,7 +88,8 @@
       webworkersOpaqueFilename: webworkersManifest['comm_opaque2_wasm_bg.wasm'],
     };
     return assetInfo;
-  } catch {
+  } catch (e) {
+    console.warn(e);
     throw new Error(
       'Could not load manifest.json for web build. ' +
         'Did you forget to run `yarn dev` in the web folder?',
@@ -106,7 +107,8 @@
     const webpackBuild = await import('web/dist/app.build.cjs');
     webpackCompiledRootComponent = webpackBuild.app.default;
     return webpackCompiledRootComponent;
-  } catch {
+  } catch (e) {
+    console.warn(e);
     throw new Error(
       'Could not load app.build.cjs. ' +
         'Did you forget to run `yarn dev` in the web folder?',