diff --git a/packages/frontend-plugin-api/src/wiring/createExtension.test.ts b/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
index 9d2aff5d99..d6e2599138 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
+++ b/packages/frontend-plugin-api/src/wiring/createExtension.test.ts
@@ -969,7 +969,7 @@ describe('createExtension', () => {
           .add(multi2Ext)
           .data(outputRef),
       ).toThrowErrorMatchingInlineSnapshot(
-        `"Failed to instantiate extension 'subject', Invalid override provided for input 'multi', when overriding the input data the length must match the original input data"`,
+        `"Failed to instantiate extension 'subject', override data provided for input 'multi' must match the length of the original inputs"`,
       );
 
       // Required input not provided
@@ -992,7 +992,7 @@ describe('createExtension', () => {
           .add(multi2Ext)
           .data(outputRef),
       ).toThrowErrorMatchingInlineSnapshot(
-        `"Failed to instantiate extension 'subject', Missing required data values for 'test1'"`,
+        `"Failed to instantiate extension 'subject', missing required extension data value(s) 'test1'"`,
       );
 
       // Wrong value provided
@@ -1021,7 +1021,7 @@ describe('createExtension', () => {
           .add(multi2Ext)
           .data(outputRef),
       ).toThrowErrorMatchingInlineSnapshot(
-        `"Failed to instantiate extension 'subject', Invalid data value provided, 'test2' was not declared"`,
+        `"Failed to instantiate extension 'subject', extension data 'test2' was provided but not declared"`,
       );
     });
   });
diff --git a/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.test.tsx b/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.test.tsx
index efca17459b..508000acbb 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.test.tsx
+++ b/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.test.tsx
@@ -462,7 +462,7 @@ describe('createExtensionBlueprint', () => {
         mockParentInputs,
       ),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Invalid override provided for input 'multi', when overriding the input data the length must match the original input data"`,
+      `"override data provided for input 'multi' must match the length of the original inputs"`,
     );
 
     // Required input not provided
@@ -484,7 +484,7 @@ describe('createExtensionBlueprint', () => {
         mockParentInputs,
       ),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Missing required data values for 'test1'"`,
+      `"missing required extension data value(s) 'test1'"`,
     );
 
     // Wrong value provided
@@ -512,7 +512,7 @@ describe('createExtensionBlueprint', () => {
         mockParentInputs,
       ),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Invalid data value provided, 'test2' was not declared"`,
+      `"extension data 'test2' was provided but not declared"`,
     );
 
     // Forwarding entire inputs object
@@ -706,7 +706,7 @@ describe('createExtensionBlueprint', () => {
         }).makeWithOverrides({ factory: orig => orig({}) }),
       ),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Invalid data value provided, 'test2' was not declared"`,
+      `"extension data 'test2' was provided but not declared"`,
     );
 
     expect(() =>
@@ -722,7 +722,7 @@ describe('createExtensionBlueprint', () => {
         }).makeWithOverrides({ factory: orig => orig({}) }),
       ),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Missing required data values for 'test1'"`,
+      `"missing required extension data value(s) 'test1'"`,
     );
   });
 
diff --git a/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.ts b/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.ts
index cd6c0d6968..74d4426207 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.ts
+++ b/packages/frontend-plugin-api/src/wiring/createExtensionBlueprint.ts
@@ -269,7 +269,7 @@ export function createDataContainer<UData extends AnyExtensionDataRef>(
     if (verifyRefs) {
       if (!verifyRefs.delete(output.id)) {
         throw new Error(
-          `Invalid data value provided, '${output.id}' was not declared`,
+          `extension data '${output.id}' was provided but not declared`,
         );
       }
     }
@@ -281,7 +281,7 @@ export function createDataContainer<UData extends AnyExtensionDataRef>(
     Array.from(verifyRefs.values()).filter(ref => !ref.config.optional);
   if (remainingRefs && remainingRefs.length > 0) {
     throw new Error(
-      `Missing required data values for '${remainingRefs
+      `missing required extension data value(s) '${remainingRefs
         .map(ref => ref.id)
         .join(', ')}'`,
     );
@@ -339,7 +339,7 @@ export function resolveInputOverrides(
         );
         if (!originalInput) {
           throw new Error(
-            `A data override was provided for input '${name}', but no original input was present.`,
+            `attempted to override data of input '${name}' but it is not present in the original inputs`,
           );
         }
         newInputs[name] = Object.assign(providedContainer, {
@@ -350,12 +350,12 @@ export function resolveInputOverrides(
       const originalInput = expectArray(inputs[name]);
       if (!Array.isArray(providedData)) {
         throw new Error(
-          `Invalid override provided for input '${name}', expected an array`,
+          `override data provided for input '${name}' must be an array`,
         );
       }
       if (originalInput.length !== providedData.length) {
         throw new Error(
-          `Invalid override provided for input '${name}', when overriding the input data the length must match the original input data`,
+          `override data provided for input '${name}' must match the length of the original inputs`,
         );
       }
       newInputs[name] = providedData.map((data, i) => {