diff --git a/platypush/backend/music/spotify/manifest.yaml b/platypush/backend/music/spotify/manifest.yaml
index 8c165cec2..83e16714f 100644
--- a/platypush/backend/music/spotify/manifest.yaml
+++ b/platypush/backend/music/spotify/manifest.yaml
@@ -18,7 +18,7 @@ manifest:
     pacman:
       - sudo
       - cargo
-    exec:
+    after:
       - sudo cargo install librespot
   package: platypush.backend.music.spotify
   type: backend
diff --git a/platypush/plugins/gpio/manifest.yaml b/platypush/plugins/gpio/manifest.yaml
index dfe358cc9..dc52185a2 100644
--- a/platypush/plugins/gpio/manifest.yaml
+++ b/platypush/plugins/gpio/manifest.yaml
@@ -1,7 +1,6 @@
 manifest:
   events:
-    - platypush.message.event.gpio.GPIOEvent:
-        When the value of a monitored PIN changes.
+    - platypush.message.event.gpio.GPIOEvent
   install:
     pip:
     - RPi.GPIO
diff --git a/platypush/plugins/http/webpage/manifest.yaml b/platypush/plugins/http/webpage/manifest.yaml
index 04560d806..c266b4ace 100644
--- a/platypush/plugins/http/webpage/manifest.yaml
+++ b/platypush/plugins/http/webpage/manifest.yaml
@@ -15,7 +15,7 @@ manifest:
       - npm
     pip:
       - weasyprint
-    exec:
+    after:
       - sudo npm install -g @postlight/mercury-parser
   package: platypush.plugins.http.webpage
   type: plugin
diff --git a/platypush/plugins/music/tidal/manifest.yaml b/platypush/plugins/music/tidal/manifest.yaml
index e047ad5dd..ba06b2575 100644
--- a/platypush/plugins/music/tidal/manifest.yaml
+++ b/platypush/plugins/music/tidal/manifest.yaml
@@ -1,7 +1,6 @@
 manifest:
   events:
-    - platypush.message.event.music.TidalPlaylistUpdatedEvent: when a user playlist
-        is updated.
+    - platypush.message.event.music.tidal.TidalPlaylistUpdatedEvent
   install:
     pip:
       - tidalapi >= 0.7.0
diff --git a/platypush/plugins/sensor/distance/vl53l1x/manifest.yaml b/platypush/plugins/sensor/distance/vl53l1x/manifest.yaml
index f041778e2..4aa00b1ab 100644
--- a/platypush/plugins/sensor/distance/vl53l1x/manifest.yaml
+++ b/platypush/plugins/sensor/distance/vl53l1x/manifest.yaml
@@ -1,6 +1,6 @@
 manifest:
   events:
-    platypush.message.event.sensor import SensorDataChangeEvent:
+    - platypush.message.event.sensor.SensorDataChangeEvent
 
   install:
     pip:
diff --git a/platypush/plugins/serial/manifest.yaml b/platypush/plugins/serial/manifest.yaml
index 1af0e50f7..2756fc834 100644
--- a/platypush/plugins/serial/manifest.yaml
+++ b/platypush/plugins/serial/manifest.yaml
@@ -1,6 +1,6 @@
 manifest:
   events:
-    - platypush.message.event.sensor.SensorDataChangeEvent:
+    - platypush.message.event.sensor.SensorDataChangeEvent
   install:
     apk:
       - py3-pyserial