Hi Vivek,
There could be multiple reasons.
- First option is to close the HANA Studio Modeler and restart. Most of the time it worked for me.
- Check if your Studio version is the same as DB version
- Please validate before activation and check if there are any errors during the validation process.
- Ensure that the underlying tables are not recently modified.
Basically you just provided the error and did not provide any background information.
Regards,
Ravi