Hi @babbel1005, there were some breaking changes since version 0.126.1 and the current 0.145.0 including one of which has an impact on custom nodes.
The error does however sound like the node might not be included in your currently running instance of n8n (see for example The node is not valid as its type "n8n-nodes-base.googleCloudNaturalLanguage" is unknown). Could you double-check whether your node has been added as described under Creating Your First Node | Docs?