*Error* dbClose: While exporting netlist cdl

Hello everyone,

am getting below error while exporting the netlist cdl.

WARNING* ddGetObj: invalid libId (0x(nil)).
*WARNING* ddGetObj: invalid libId (0x(nil)).

si: simOpenSimForeGndLogFile() - cannot create the file /si.foregnd.log.
si: Can't open the file "si.env" for writing.
[INFO] (flowenabler): -- Loading /pkg/nxp-flowenabler-/1.7/cdssite/.simrc...
si: Can't open the file "si.env" for writing.

*Error* dbClose: argument #1 should be a database object (type template = "d") - nil
<<< Stack Trace >>>
(... in netlist ...)
netlist()
let((op runDirPath singleFile mvFile) simInitEnvWithArgs(((form->Topcell)->value) ((form->lib_view_Entry)->value) ((form->Topcell)->value) "schematic" "auCdl" nil) netlist() (mvFile = sprintf(nil "mv -f ./%s/netlist ./%s.cdl" ((form->Topcell)->value) ((form->Topcell)->value))) system(mvFile))
CCSRunNetlisterCell(hiGetCurrentForm())
hiFormCancel(form)
cancelform(hiGetCurrentForm())

here is the code i put in test-case-

lib_view_Label=hiCreateLabel(
?name 'lib_view_Label
?labelText "Cell View*"
?justification 'left
)
lib_view_Entry=hiCreateStringField(
?name 'lib_view_Entry
?callback "CCSRunNetlisterCell(hiGetCurrentForm())"
?enabled nil
)

cellLabel=hiCreateLabel(
?name 'cellLabel ?labelText "Top Cell*"
?justification 'left
)
Topcell=hiCreateStringField(
?name 'Topcell ?callback "(ddsUpdateSyncWithForm)"

)
browse=hiCreateFormButton(
?name 'browse
?buttonText "Browse..."
?callback "(ddsSyncWithForm (hiGetCurrentForm) 'browse 'lib_view_Entry 'Topcell )"
)

procedure(CCSRunNetlisterCell(form)
let( (op runDirPath singleFile mvFile )
simInitEnvWithArgs(form->Topcell->value form->lib_view_Entry->value form->Topcell->value "schematic" "auCdl" nil)
netlist()
mvFile=sprintf(nil "mv -f ./%s/netlist ./%s.cdl" form->Topcell->value form->Topcell->value)
system(mvFile)
)
)

Pls guide whats the error and how to correct it?