Hi Arjun,
Hope you are keeping well.
Kindly share few details for further investigation.
1- Kindly share the error screenshot for protected DLL.
2- Sentinel Envelope version that you are using for protection.
3- Sentinel Envelop project file (.prjx) for further investigation.
4- If it is possible then share sample unprotected application that
replicates same issue at our end with issue replication steps.
Thank You,
Anubhav