TBrowser is not opening

I am opening a new TBrowser with the command

root[0] new TBrowser

It is showing the following errors:

cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TGVSplitter::TGVSplitter>: splitterv.xpm not found
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TGHSplitter::TGHSplitter>: splitterh.xpm not found
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TGComboBox::TGComboBox>: arrow_down.xpm not found
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TInterpreter::TCling::AutoLoad>: failure loading library libASImage.so for TASImage
cling::DynamicLibraryManager::loadLibrary(): libpng12.so.0: cannot open shared object file: No such file or directory
Error in <TGVScrollBar::TGVScrollBar>: arrow_*.xpm not found

 *** Break *** segmentation violation

There was a crash.
This is the entire stack trace of all threads:


ROOT Version: 6.08
Platform: Ubuntu 18.04
Compiler: Not Provided


Have you installed ROOT from sources or are using using a preinstalled version ?

I have installed from the source. The same error occurs for TTreeViewer.
When I open it with the command
root[0] TBrowser b, then the error is:

Error in TGVSplitter::TGVSplitter: splitterv.xpm not found
Error in TGHSplitter::TGHSplitter: splitterh.xpm not found
Error in TGComboBox::TGComboBox: arrow_down.xpm not found
Error in TGVScrollBar::TGVScrollBar: arrow_*.xpm not found

*** Break *** segmentation violation

===========================================================
There was a crash.
This is the entire stack trace of all threads:

#0 0x00007efff7bab687 in __GI___waitpid (pid=12207, stat_loc=stat_loc
entry=0x7ffdcf526658, options=options
entry=0) at …/sysdeps/unix/sysv/linux/waitpid.c:30
#1 0x00007efff7b16067 in do_system (line=) at …/sysdeps/posix/system.c:149
#2 0x00007efff8b43e64 in TUnixSystem::StackTrace() () from /home/chetan/root-6.08.02/lib/libCore.so
#3 0x00007efff8b467bc in TUnixSystem::DispatchSignals(ESignals) () from /home/chetan/root-6.08.02/lib/libCore.so
#4
#5 0x00007effe1710458 in TGVScrollBar::SetPosition(int) () from /home/chetan/root-6.08.02/lib/libGui.so
#6 0x00007effe16c6ff6 in TGListBox::Layout() () from /home/chetan/root-6.08.02/lib/libGui.so
#7 0x00007effe16a3792 in TGFrame::Resize(unsigned int, unsigned int) () from /home/chetan/root-6.08.02/lib/libGui.so
#8 0x00007effe16c5147 in TGListBox::Resize(unsigned int, unsigned int) () from /home/chetan/root-6.08.02/lib/libGui.so
#9 0x00007effe1650b23 in TGComboBox::Init() () from /home/chetan/root-6.08.02/lib/libGui.so
#10 0x00007effe165248c in TGComboBox::TGComboBox(TGWindow const*, char const*, int, unsigned int, unsigned long) () from /home/chetan/root-6.08.02/lib/libGui.so
#11 0x00007effe17203e2 in TGFileBrowser::CreateBrowser() () from /home/chetan/root-6.08.02/lib/libGui.so
#12 0x00007effe17248e3 in TGFileBrowser::TGFileBrowser(TGWindow const*, TBrowser*, unsigned int, unsigned int) () from /home/chetan/root-6.08.02/lib/libGui.so
#13 0x00007efff90880c2 in ?? ()
#14 0x0000000000000000 in ?? ()

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