here is the error message:
System.IO.IOException: ERROR: No matching mod for tr in sequence (ac)AEIEHAK(tr)AQR (line 11). Make sure you have provided the correct modifications[.local].xml file.
Command-line: C:\Users\User_MM\AppData\Local\Apps\2.0\40E9NE9A.31E\6ZCRXR1Z.84W\skyl..tion_e4141a2a22107248_0014.0001_a618d1d4217289b5\BlibBuild -s -A -H -o -c 0.95 -i library -S "C:\Users\User_MM\AppData\Local\Temp\tmp6291.tmp" "X:\Projets\Bon\20200309_IP_Bon\skyline\library.redundant.blib"
Working directory: X:\Projets\Bon\20200309_IP_Bon\MQ_Output\20200716_Propionylation_variable_1_18\txt
at pwiz.Common.SystemUtil.ProcessRunner.Run(ProcessStartInfo psi, String stdin, IProgressMonitor progress, IProgressStatus& status, TextWriter writer) in C:\proj\skyline_20_1_x64\pwiz_tools\Shared\Common\SystemUtil\ProcessRunner.cs:line 62
at pwiz.BiblioSpec.BlibBuild.BuildLibrary(LibraryBuildAction libraryBuildAction, IProgressMonitor progressMonitor, IProgressStatus& status, String& commandArgs, String& messageLog, String[]& ambiguous) in C:\proj\skyline_20_1_x64\pwiz_tools\Shared\BiblioSpec\BlibBuild.cs:line 201
at pwiz.Skyline.Model.Lib.BiblioSpecLiteBuilder.BuildLibrary(IProgressMonitor progress) in C:\proj\skyline_20_1_x64\pwiz_tools\Skyline\Model\Lib\BiblioSpecLiteBuilder.cs:line 160