docs: Adds example to error code page (#7010)

docs/core_docs/.gitignore

@@ -288,16 +288,6 @@ docs/integrations/text_embedding/bedrock.md
 docs/integrations/text_embedding/bedrock.mdx
 docs/integrations/text_embedding/azure_openai.md
 docs/integrations/text_embedding/azure_openai.mdx
-docs/integrations/retrievers/tavily.md
-docs/integrations/retrievers/tavily.mdx
-docs/integrations/retrievers/kendra-retriever.md
-docs/integrations/retrievers/kendra-retriever.mdx
-docs/integrations/retrievers/exa.md
-docs/integrations/retrievers/exa.mdx
-docs/integrations/retrievers/bm25.md
-docs/integrations/retrievers/bm25.mdx
-docs/integrations/retrievers/bedrock-knowledge-bases.md
-docs/integrations/retrievers/bedrock-knowledge-bases.mdx
 docs/integrations/llms/together.md
 docs/integrations/llms/together.mdx
 docs/integrations/llms/openai.md
@@ -320,6 +310,32 @@ docs/integrations/llms/azure.md
 docs/integrations/llms/azure.mdx
 docs/integrations/llms/arcjet.md
 docs/integrations/llms/arcjet.mdx
+docs/integrations/retrievers/tavily.md
+docs/integrations/retrievers/tavily.mdx
+docs/integrations/retrievers/kendra-retriever.md
+docs/integrations/retrievers/kendra-retriever.mdx
+docs/integrations/retrievers/exa.md
+docs/integrations/retrievers/exa.mdx
+docs/integrations/retrievers/bm25.md
+docs/integrations/retrievers/bm25.mdx
+docs/integrations/retrievers/bedrock-knowledge-bases.md
+docs/integrations/retrievers/bedrock-knowledge-bases.mdx
+docs/integrations/retrievers/self_query/weaviate.md
+docs/integrations/retrievers/self_query/weaviate.mdx
+docs/integrations/retrievers/self_query/vectara.md
+docs/integrations/retrievers/self_query/vectara.mdx
+docs/integrations/retrievers/self_query/supabase.md
+docs/integrations/retrievers/self_query/supabase.mdx
+docs/integrations/retrievers/self_query/qdrant.md
+docs/integrations/retrievers/self_query/qdrant.mdx
+docs/integrations/retrievers/self_query/pinecone.md
+docs/integrations/retrievers/self_query/pinecone.mdx
+docs/integrations/retrievers/self_query/memory.md
+docs/integrations/retrievers/self_query/memory.mdx
+docs/integrations/retrievers/self_query/hnswlib.md
+docs/integrations/retrievers/self_query/hnswlib.mdx
+docs/integrations/retrievers/self_query/chroma.md
+docs/integrations/retrievers/self_query/chroma.mdx
 docs/integrations/chat/togetherai.md
 docs/integrations/chat/togetherai.mdx
 docs/integrations/chat/openai.md
@@ -350,32 +366,6 @@ docs/integrations/chat/arcjet.md
 docs/integrations/chat/arcjet.mdx
 docs/integrations/chat/anthropic.md
 docs/integrations/chat/anthropic.mdx
-docs/integrations/retrievers/self_query/weaviate.md
-docs/integrations/retrievers/self_query/weaviate.mdx
-docs/integrations/retrievers/self_query/vectara.md
-docs/integrations/retrievers/self_query/vectara.mdx
-docs/integrations/retrievers/self_query/supabase.md
-docs/integrations/retrievers/self_query/supabase.mdx
-docs/integrations/retrievers/self_query/qdrant.md
-docs/integrations/retrievers/self_query/qdrant.mdx
-docs/integrations/retrievers/self_query/pinecone.md
-docs/integrations/retrievers/self_query/pinecone.mdx
-docs/integrations/retrievers/self_query/memory.md
-docs/integrations/retrievers/self_query/memory.mdx
-docs/integrations/retrievers/self_query/hnswlib.md
-docs/integrations/retrievers/self_query/hnswlib.mdx
-docs/integrations/retrievers/self_query/chroma.md
-docs/integrations/retrievers/self_query/chroma.mdx
-docs/integrations/document_loaders/file_loaders/unstructured.md
-docs/integrations/document_loaders/file_loaders/unstructured.mdx
-docs/integrations/document_loaders/file_loaders/text.md
-docs/integrations/document_loaders/file_loaders/text.mdx
-docs/integrations/document_loaders/file_loaders/pdf.md
-docs/integrations/document_loaders/file_loaders/pdf.mdx
-docs/integrations/document_loaders/file_loaders/directory.md
-docs/integrations/document_loaders/file_loaders/directory.mdx
-docs/integrations/document_loaders/file_loaders/csv.md
-docs/integrations/document_loaders/file_loaders/csv.mdx
 docs/integrations/document_loaders/web_loaders/web_puppeteer.md
 docs/integrations/document_loaders/web_loaders/web_puppeteer.mdx
 docs/integrations/document_loaders/web_loaders/web_cheerio.md
@@ -387,4 +377,14 @@ docs/integrations/document_loaders/web_loaders/pdf.mdx
 docs/integrations/document_loaders/web_loaders/langsmith.md
 docs/integrations/document_loaders/web_loaders/langsmith.mdx
 docs/integrations/document_loaders/web_loaders/firecrawl.md
-docs/integrations/document_loaders/web_loaders/firecrawl.mdx
+docs/integrations/document_loaders/web_loaders/firecrawl.mdx
+docs/integrations/document_loaders/file_loaders/unstructured.md
+docs/integrations/document_loaders/file_loaders/unstructured.mdx
+docs/integrations/document_loaders/file_loaders/text.md
+docs/integrations/document_loaders/file_loaders/text.mdx
+docs/integrations/document_loaders/file_loaders/pdf.md
+docs/integrations/document_loaders/file_loaders/pdf.mdx
+docs/integrations/document_loaders/file_loaders/directory.md
+docs/integrations/document_loaders/file_loaders/directory.mdx
+docs/integrations/document_loaders/file_loaders/csv.md
+docs/integrations/document_loaders/file_loaders/csv.mdx

docs/core_docs/docs/troubleshooting/errors/INVALID_PROMPT_INPUT.mdx

@@ -2,12 +2,55 @@
 
 A [prompt template](/docs/concepts#prompt-templates) received missing or invalid input variables.
 
+One unexpected way this can occur is if you add a JSON object directly into a prompt template:
+
+```ts
+import { PromptTemplate } from "@langchain/core/prompts";
+import { ChatOpenAI } from "@langchain/openai";
+
+const prompt = PromptTemplate.fromTemplate(`You are a helpful assistant.
+
+Here is an example of how you should respond:
+
+{
+  "firstName": "John",
+  "lastName": "Doe",
+  "age": 21
+}
+
+Now, answer the following question:
+
+{question}`);
+```
+
+You might think that the above prompt template should require a single input key named `question`, but the JSON object will be
+interpreted as an additional variable because the curly braces (`{`) are not escaped, and should be preceded by a second brace instead, like this:
+
+```ts
+import { PromptTemplate } from "@langchain/core/prompts";
+import { ChatOpenAI } from "@langchain/openai";
+
+const prompt = PromptTemplate.fromTemplate(`You are a helpful assistant.
+
+Here is an example of how you should respond:
+
+{{
+  "firstName": "John",
+  "lastName": "Doe",
+  "age": 21
+}}
+
+Now, answer the following question:
+
+{question}`);
+```
+
 ## Troubleshooting
 
 The following may help resolve this error:
 
 - Double-check your prompt template to ensure that it is correct.
-  - If you are using the default format and you are using curly braces `{` anywhere in your template, they should be double escaped like this: `{{`.
+  - If you are using default formatting and you are using curly braces `{` anywhere in your template, they should be double escaped like this: `{{`, as shown above.
 - If you are using a [`MessagesPlaceholder`](/docs/concepts/#messagesplaceholder), make sure that you are passing in an array of messages or message-like objects.
   - If you are using shorthand tuples to declare your prompt template, make sure that the variable name is wrapped in curly braces (`["placeholder", "{messages}"]`).
 - Try viewing the inputs into your prompt template using [LangSmith](https://docs.smith.langchain.com/) or log statements to confirm they appear as expected.