Show error if method fails in tools

packages/docs/src/.vitepress/theme/components/PrimitiveTool.vue

@@ -69,7 +69,7 @@
                   type="text"
                   v-model="state.selectedMethod.models[i]"
                 />
-                <div v-if="state.error" class="text-error">{{ state.error }}</div>
+                <div v-if="state.selectedMethod.error" class="text-error">{{ state.selectedMethod.error }}</div>
               </div>
             </template>
           </div>
@@ -131,6 +131,9 @@ export interface Method<Primitive> {
   // Result of method execution,
   result?: string;
 
+  // Error (if one occurred).
+  error?: string;
+
   // Function that takes the models and returns the primitive
   callback: (primitive: Primitive, value: Array<any>) => string;
 
@@ -222,7 +225,11 @@ async function executeMethod(wrappedMethod: () => string | Promise<string>): str
     }
 
     state.value.selectedMethod.result = await wrappedMethod;
+
+    state.value.selectedMethod.error = undefined;
   } catch(error: any) {
+    state.value.selectedMethod.error = error.message;
+
     return error.message;
   }
 };