Profiling

[JG]

I was trying to profile a d program. So I ran: dub build 
--build=profile. I then ran the program and it produced trace.log 
and trace.def. I then ran d-profile-viewer and got the following 
error:

std.conv.ConvException@/home/jg/dlang/ldc-1.24.0/bin/../import/std/conv.d(2382): Unexpected '-' when converting from type char[] to type ulong
----------------
??:? [0x564a8630fda5]
??:? [0x564a86333286]
??:? [0x564a863199fd]
/home/jg/dlang/ldc-1.24.0/bin/../import/std/conv.d:2382 
[0x564a862c89a1]
/home/jg/dlang/ldc-1.24.0/bin/../import/std/conv.d:1941 
[0x564a862c86cc]
/home/jg/dlang/ldc-1.24.0/bin/../import/std/conv.d:223 
[0x564a862c869c]
app.d:1095 [0x564a862cdd71]
app.d:1138 [0x564a862ce7ba]
??:? [0x564a863196cb]
??:? [0x564a863195c7]
??:? [0x564a8631941d]
/home/jg/dlang/ldc-1.24.0/bin/../import/core/internal/entrypoint.d:42 [0x564a862ce7e4]
??:? __libc_start_main [0x7fd482807cb1]

Is d-profile-viewer no longer working? Or did I do something 
wrong?