diff --git a/sim-cli/src/main.rs b/sim-cli/src/main.rs
index f88aa2a1..0aa5ff05 100644
--- a/sim-cli/src/main.rs
+++ b/sim-cli/src/main.rs
@@ -114,17 +114,17 @@ async fn main() -> anyhow::Result<()> {
         );
 
         if clients.contains_key(&node_info.pubkey) {
-            anyhow::bail!(LightningError::ValidationError(format!(
-                "duplicated node: {}.",
-                node_info.pubkey
-            )));
+            anyhow::bail!(
+                "Lightning Error\nCaused by: {}",
+                LightningError::ValidationError(format!("duplicated node: {}.", node_info.pubkey))
+            );
         }
 
         if alias_node_map.contains_key(&node_info.alias) {
-            anyhow::bail!(LightningError::ValidationError(format!(
-                "duplicated node: {}.",
-                node_info.alias
-            )));
+            anyhow::bail!(
+                "Lightning Error\nCaused by: {}",
+                LightningError::ValidationError(format!("duplicated node: {}.", node_info.alias))
+            );
         }
 
         clients.insert(node_info.pubkey, node);
@@ -143,10 +143,13 @@ async fn main() -> anyhow::Result<()> {
         } {
             source.clone()
         } else {
-            anyhow::bail!(LightningError::ValidationError(format!(
-                "activity source {} not found in nodes.",
-                act.source
-            )));
+            anyhow::bail!(
+                "Lightning Error\nCaused by: {}",
+                LightningError::ValidationError(format!(
+                    "activity source {} not found in nodes.",
+                    act.source
+                ))
+            );
         };
 
         let destination = match &act.destination {
@@ -154,10 +157,13 @@ async fn main() -> anyhow::Result<()> {
                 if let Some(info) = alias_node_map.get(a) {
                     info.clone()
                 } else {
-                    anyhow::bail!(LightningError::ValidationError(format!(
-                        "unknown activity destination: {}.",
-                        act.destination
-                    )));
+                    anyhow::bail!(
+                        "Lightning Error\nCaused by: {}",
+                        LightningError::ValidationError(format!(
+                            "unknown activity destination: {}.",
+                            act.destination
+                        ))
+                    );
                 }
             },
             NodeId::PublicKey(pk) => {
@@ -174,7 +180,7 @@ async fn main() -> anyhow::Result<()> {
                         .map_err(|e| {
                             log::debug!("{}", e);
                             LightningError::ValidationError(format!(
-                                "Destination node unknown or invalid: {}.",
+                                "Lightning Error\nDestination node unknown or invalid: {}.",
                                 pk,
                             ))
                         })?
diff --git a/sim-lib/src/lib.rs b/sim-lib/src/lib.rs
index 116d491e..9778471f 100644
--- a/sim-lib/src/lib.rs
+++ b/sim-lib/src/lib.rs
@@ -171,7 +171,7 @@ pub struct ActivityDefinition {
 
 #[derive(Debug, Error)]
 pub enum SimulationError {
-    #[error("Lightning Error: {0:?}")]
+    #[error("Lightning Error")]
     LightningError(#[from] LightningError),
     #[error("TaskError")]
     TaskError,
@@ -195,19 +195,19 @@ pub enum SimulationError {
 
 #[derive(Debug, Error)]
 pub enum LightningError {
-    #[error("Node connection error: {0}")]
+    #[error("Node connection error\nCaused by: {0}")]
     ConnectionError(String),
-    #[error("Get info error: {0}")]
+    #[error("Get info error\n{0}")]
     GetInfoError(String),
-    #[error("Send payment error: {0}")]
+    #[error("Send payment error\n{0}")]
     SendPaymentError(String),
-    #[error("Track payment error: {0}")]
+    #[error("Track payment error\n{0}")]
     TrackPaymentError(String),
     #[error("Invalid payment hash")]
     InvalidPaymentHash,
-    #[error("Get node info error: {0}")]
+    #[error("Get node info error\n{0}")]
     GetNodeInfoError(String),
-    #[error("Config validation failed: {0}")]
+    #[error("Config validation failed {0}")]
     ValidationError(String),
     #[error("Permanent error: {0:?}")]
     PermanentError(String),
@@ -466,7 +466,7 @@ impl Simulation {
                     let node = node.lock().await;
                     if !node.get_info().features.supports_keysend() {
                         return Err(LightningError::ValidationError(format!(
-                            "All nodes eligible for random activity generation must support keysend, {} does not",
+                            "All nodes eligible for random activity generation must support keysend,\n{} does not",
                             node.get_info()
                         )));
                     }
diff --git a/sim-lib/src/random_activity.rs b/sim-lib/src/random_activity.rs
index f8a50e75..31a48c14 100644
--- a/sim-lib/src/random_activity.rs
+++ b/sim-lib/src/random_activity.rs
@@ -13,7 +13,7 @@ const SECONDS_PER_MONTH: u64 = HOURS_PER_MONTH * 60 * 60;
 
 #[derive(Debug, Error)]
 pub enum RandomActivityError {
-    #[error("Value error: {0}")]
+    #[error("Value error\nCaused by: {0}")]
     ValueError(String),
     #[error("InsufficientCapacity: {0}")]
     InsufficientCapacity(String),