diff --git a/src/transaction.ts b/src/transaction.ts
index 858a67f..e9cc54a 100644
--- a/src/transaction.ts
+++ b/src/transaction.ts
@@ -518,7 +518,10 @@ export class Transaction {
   ): psbt.TransactionOutput {
     let { amount, script } = o;
     if (amount === undefined) amount = cur?.amount;
-    if (typeof amount !== 'bigint') throw new Error('amount must be bigint sats');
+    if (typeof amount !== 'bigint')
+      throw new Error(
+        `Wrong amount type, should be of type bigint in sats, but got ${amount} of type ${typeof amount}`
+      );
     if (typeof script === 'string') script = hex.decode(script);
     if (script === undefined) script = cur?.script;
     let res: psbt.PSBTKeyMapKeys<typeof psbt.PSBTOutput> = { ...cur, ...o, amount, script };
diff --git a/src/utxo.ts b/src/utxo.ts
index f976bd4..5df85d4 100644
--- a/src/utxo.ts
+++ b/src/utxo.ts
@@ -284,7 +284,12 @@ function getScript(o: Output, opts: TxOpts = {}, network = NETWORK) {
     script = OutScript.encode(Address(network).decode(o.address));
   }
   if (!script) throw new Error('Estimator: wrong output script');
-  if (typeof o.amount !== 'bigint') throw new Error(`Estimator: wrong output amount=${o.amount}`);
+  if (typeof o.amount !== 'bigint')
+    throw new Error(
+      `Estimator: wrong output amount=${
+        o.amount
+      }, should be of type bigint but got ${typeof o.amount}.`
+    );
   if (script && !opts.allowUnknownOutputs && OutScript.decode(script).type === 'unknown') {
     throw new Error(
       'Estimator: unknown output script type, there is a chance that input is unspendable. Pass allowUnknownOutputs=true, if you sure'
@@ -333,9 +338,18 @@ export class _Estimator {
     private opts: EstimatorOpts
   ) {
     if (typeof opts.feePerByte !== 'bigint')
-      throw new Error(`Estimator: wrong feePerByte=${opts.feePerByte}`);
+      throw new Error(
+        `Estimator: wrong feePerByte=${
+          opts.feePerByte
+        }, should be of type bigint but got ${typeof opts.feePerByte}.`
+      );
     if (opts.dust) {
-      if (typeof opts.dust !== 'bigint') throw new Error(`Estimator: wrong dust=${opts.dust}`);
+      if (typeof opts.dust !== 'bigint')
+        throw new Error(
+          `Estimator: wrong dust=${
+            opts.dust
+          }, should be of type bigint but got ${typeof opts.dust}.`
+        );
       this.dust = opts.dust;
     }
     if (opts.requiredInputs !== undefined && !Array.isArray(opts.requiredInputs))