feat(docs,core): Adds error reference pages and populate codes on errors in core

docs/core_docs/.gitignore

@@ -222,6 +222,8 @@ docs/versions/migrating_memory/conversation_buffer_window_memory.md
 docs/versions/migrating_memory/conversation_buffer_window_memory.mdx
 docs/versions/migrating_memory/chat_history.md
 docs/versions/migrating_memory/chat_history.mdx
+docs/troubleshooting/errors/INVALID_TOOL_RESULTS.md
+docs/troubleshooting/errors/INVALID_TOOL_RESULTS.mdx
 docs/integrations/vectorstores/weaviate.md
 docs/integrations/vectorstores/weaviate.mdx
 docs/integrations/vectorstores/upstash.md
@@ -260,6 +262,10 @@ docs/integrations/toolkits/sql.md
 docs/integrations/toolkits/sql.mdx
 docs/integrations/toolkits/openapi.md
 docs/integrations/toolkits/openapi.mdx
+docs/integrations/stores/in_memory.md
+docs/integrations/stores/in_memory.mdx
+docs/integrations/stores/file_system.md
+docs/integrations/stores/file_system.mdx
 docs/integrations/text_embedding/togetherai.md
 docs/integrations/text_embedding/togetherai.mdx
 docs/integrations/text_embedding/openai.md
@@ -282,10 +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/stores/in_memory.md
-docs/integrations/stores/in_memory.mdx
-docs/integrations/stores/file_system.md
-docs/integrations/stores/file_system.mdx
 docs/integrations/retrievers/tavily.md
 docs/integrations/retrievers/tavily.mdx
 docs/integrations/retrievers/kendra-retriever.md
@@ -364,6 +366,16 @@ 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
@@ -375,14 +387,4 @@ 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/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/firecrawl.mdx

docs/core_docs/docs/additional_resources/tutorials.mdx

@@ -1,6 +1,6 @@
-# Tutorials
+# External guides
 
-Below are links to tutorials and courses on LangChain.js. For written guides on common use cases for LangChain.js, check out the [tutorials](/docs/tutorials/) and [how to](/docs/how_to/) sections.
+Below are links to external tutorials and courses on LangChain.js. For other written guides on common use cases for LangChain.js, check out the [tutorials](/docs/tutorials/) and [how to](/docs/how_to/) sections.
 
 ---
 

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

@@ -0,0 +1,14 @@
+# INVALID_PROMPT_INPUT
+
+A [prompt template](/docs/concepts#prompt-templates) received missing or invalid input variables.
+
+## 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 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.
+- If you are pulling a prompt from the [LangChain Prompt Hub](https://smith.langchain.com/prompts), try pulling and logging it or running it in isolation with a sample input to confirm that it is what you expect.