Error in Opening of the MATLAB SIMULINK MODEL

I have tried many times to open my MATLAB SIMULINK model in 2016a version. The Simulink window opeing does not have toolbar at the top:

I tried few of the commands whose results were shown below. May Please help me out from this problem

>> restoredefaultpath

Warning: Duplicate directory name: C:\Program Files\MATLAB\R2016a\toolbox\stateflow\stateflow

> In restoredefaultpath (line 52)

>> pthtool

Undefined function or variable 'pthtool'.

Did you mean:

>> pathtool

>> restoredefaultpath

Warning: Duplicate directory name: C:\Program Files\MATLAB\R2016a\toolbox\stateflow\stateflow

> In restoredefaultpath (line 52)

>> pathtool

>> pathtool

>> restoredefaultpath

Warning: Duplicate directory name: C:\Program Files\MATLAB\R2016a\toolbox\stateflow\stateflow

> In restoredefaultpath (line 52)

>> rehash toolboxcache

>> sl_refresh_customizations

Error using Simulink.scopes.ViewerLibraryCache>loc_initializeUserLibraries (line 145)

File 'C:\Program Files\MATLAB\R2016a\toolbox\comm\comm\commviewers2.slx' does not contain a valid Simulink model in SLX

format: Could not open destination package

Error in Simulink.scopes.ViewerLibraryCache/loadCustomLibraries (line 93)

loc_initializeUserLibraries( self, cm );

Error in slCustomizer/refresh

Error in slCustomizer.staticRefresh

Error in sl_refresh_customizations (line 18)

slCustomizer.staticRefresh();

>> RESTOREDEFAULTPATH

Cannot find an exact (case-sensitive) match for 'RESTOREDEFAULTPATH'

The closest match is: restoredefaultpath in C:\Program Files\MATLAB\R2016a\toolbox\local\restoredefaultpath.m

Did you mean:

>> restoredefaultpath

Warning: Duplicate directory name: C:\Program Files\MATLAB\R2016a\toolbox\stateflow\stateflow

> In restoredefaultpath (line 52)

>> pathtool

>> savepth

Undefined function or variable 'savepth'.

Did you mean:

>> savepath

>> sl_refresh_customizations

Error using Simulink.scopes.ViewerLibraryCache>loc_initializeUserLibraries (line 145)

File 'C:\Program Files\MATLAB\R2016a\toolbox\comm\comm\commviewers2.slx' does not contain a valid Simulink model in SLX

format: Could not open destination package

Error in Simulink.scopes.ViewerLibraryCache/loadCustomLibraries (line 93)

loc_initializeUserLibraries( self, cm );

Error in slCustomizer/refresh

Error in slCustomizer.staticRefresh

Error in sl_refresh_customizations (line 18)

slCustomizer.staticRefresh();

>>