couldn't execute "display": no such file or directory couldn't execute "display": no such file or directory while executing "exec display [format "free-energy.%d.png" $i ] &" (procedure "::ParseFEP::fepdisp_unix" line 1136) invoked from within "::ParseFEP::fepdisp_unix " (procedure "::ParseFEP::namdparse" line 157) invoked from within "::ParseFEP::namdparse" (in namespace inscope "::ParseFEP" script line 23) invoked from within "::namespace inscope ::ParseFEP { ##if {$::ParseFEP::fepbofile != ""} {set ::ParseFEP::sosindex 1 } if { [string length $fepofile] < 1 } { tk_dial..." invoked from within ".parseFEP.runbutton invoke" ("uplevel" body line 1) invoked from within "uplevel #0 [list $w invoke]" (procedure "tk::ButtonUp" line 22) invoked from within "tk::ButtonUp .parseFEP.runbutton" (command bound to event)