Connection error for port
Opening JDBC connection to None failed with SQLState: S1000 Error code: -451 Message: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@3ed1300e[file =C:\Users\NEHA\Documents\Mendix\PurchaseApp-main_2\deployment\data\database\hsqldb\default\default.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2022-04-22 05:09:07 heartbeat - read: -4158 ms. Retrying...(3/4)
Please check out this question: https://forum.mendix.com/link/questions/103195
Would that solve it?
If not, can you provide a little more information? Did it work before? What changed since then? Did you restart the computer and did that change anything?
It may help moving your mendix project to a folder outside of you user folder and make sure it is not on a onedrive folder for example. Other tools may interfere with the working of Mendix.
I hope this helps.