1) For the Resources folder, just make sure that the "Resources" folder withing the "Super Text Mesh" folder is where it should be - it's important that *all* of the folders within keep the same names. (The folders are named things like STMDelays, STMGradients) They can be moved to a different folder named "Resources" but for organizational reasons, it's much easier to keep them where they are. The error you received is specifically for the file "SuperTextMeshData" being moved from this folder, so please make sure it stays in a folder named "Resources".
If you receive this message upon first importing STM, it's normal.
2) This error is being called because "data" is null... "data" is a the variable that points towards the above "SuperTextMeshData" file, so I believe these errors are one and the same.
So... please make sure the "SuperTextMeshData" file is in a folder named "Resources"! I believe that will solve the issue.