Error when building OPTEE QEMU on Ubuntu

Error when building OPTEE QEMU on Ubuntu

[cezane]

Hello. 

I am following these steps to build OPTEE: https://github.com/OP-TEE/build . When I ran make, I got this error below: 

build.py... 
: error C0DE: Unknown fatal error when processing [] 

(Please send email to edk2-devel@lists.01.org for help, attaching following call stack trace!) 

(Python 2.7.6 on linux2) Traceback (most recent call last): 
File "/home/cezane/Workspace/optee_qemu/devel/optee/build/../edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 2484, in Main 
MyBuild = Build(Target, Workspace, Option) 
File "/home/cezane/Workspace/optee_qemu/devel/optee/build/../edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 830, in __init__ 
self.Db = WorkspaceDatabase(GlobalData.gDatabasePath, self.Reparse) 
File "/home/cezane/Workspace/optee_qemu/devel/optee/edk2/BaseTools/Source/Python/Workspace/WorkspaceDatabase.py", line 168, in __init__ 
self.Conn.execute("PRAGMA synchronous=OFF") 
OperationalError: database is locked 

- Failed - 
Build end time: 11:31:59, Mar.12 2018 
Build total time: 00:00:06 

Exception AttributeError: "'WorkspaceDatabase' object has no attribute 'Cur'" in <bound method WorkspaceDatabase.__del__ of <Workspace.WorkspaceDatabase.WorkspaceDatabase object at 0x2b242d8e7cd0>> ignored 
make[1]: *** [all] Error 1 
make[1]: Leaving directory `/home/cezane/Workspace/optee_qemu/devel/optee/edk2' 
make: *** [edk2-common] Error 2 

Can anyone help me? 
Thank you.