[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Protocol](https://evolu.dev/docs/api-reference/common/local-first/Protocol) › ProtocolVersionError

Defined in: [packages/common/src/local-first/Protocol.ts:450](https://github.com/evoluhq/evolu/blob/f082fdd974e25fa0eb1134e4b34f15b740af8fe2/packages/common/src/local-first/Protocol.ts#L450)

Represents a version mismatch in the Evolu Protocol. Occurs when the
initiator and non-initiator are using incompatible protocol versions.

## Extends

- [`OwnerError`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError).[`Typed`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed)\<`"ProtocolVersionError"`\>

## Properties

<a id="isinitiator"></a>

### isInitiator

```ts
readonly isInitiator: boolean;
```

Defined in: [packages/common/src/local-first/Protocol.ts:454](https://github.com/evoluhq/evolu/blob/f082fdd974e25fa0eb1134e4b34f15b740af8fe2/packages/common/src/local-first/Protocol.ts#L454)

Indicates which side is obsolete and should update.

---

<a id="ownerid"></a>

### ownerId

```ts
readonly ownerId: string & Brand<"Id"> & Brand<"OwnerId">;
```

Defined in: [packages/common/src/local-first/Owner.ts:550](https://github.com/evoluhq/evolu/blob/f082fdd974e25fa0eb1134e4b34f15b740af8fe2/packages/common/src/local-first/Owner.ts#L550)

#### Inherited from

[`OwnerError`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError).[`ownerId`](https://evolu.dev/docs/api-reference/common/local-first/Owner/interfaces/OwnerError#ownerid)

---

<a id="type"></a>

### type

```ts
readonly type: "ProtocolVersionError";
```

Defined in: [packages/common/src/Type.ts:15402](https://github.com/evoluhq/evolu/blob/f082fdd974e25fa0eb1134e4b34f15b740af8fe2/packages/common/src/Type.ts#L15402)

#### Inherited from

[`Typed`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed).[`type`](https://evolu.dev/docs/api-reference/common/Type/interfaces/Typed#type)

---

<a id="version"></a>

### version

```ts
readonly version: number & Brand<"NonNaN"> & Brand<"Finite"> & Brand<"Int"> & Brand<"NonNegative">;
```

Defined in: [packages/common/src/local-first/Protocol.ts:452](https://github.com/evoluhq/evolu/blob/f082fdd974e25fa0eb1134e4b34f15b740af8fe2/packages/common/src/local-first/Protocol.ts#L452)