Application Designer Error: “SPDP_XXXX has been updated by another user. (3,1)

We get this error when we try to save our project or pages etc. To resolve this error, clear the  application designer CACHE and reopen the Application Designer.

To clear Application Designer CACHE:
go to Configuration manager-->under "Cache Files" section-->Click on "Purge Cache Directories.." button.
OR CACHE directory is specified at "Directory" field. Go to Cache path and delete all files under that folder.
  

Application Designer is getting closed automatically when we build the records

Application Designer is getting closed automatically when we build the records. Log file shows below error:


ORA-01157: cannot identify/lock data file 201 - see DBWR trace file ORA-01110: data file 201:
'/oradata/VRMSDV/pstemp01.dbf' ORA-06512: at "SYS.DBMS_LOB", line 664 ORA-06512: at "SYS.DBMS_METADATA", line 3825 ORA-06512: at "SYS.DBMS_METADATA", line 567
Failed SQL stmt: SELECT DBMS_METADATA.GET_DDL('TABLE',:1) from dual



Solution:  Here problem is with the TEMP tablespace it either doesn't exist or doesn't have sufficien space. Create TEMP tablespace and try again to build it.