我正在使用Visual Studio 2015。 当我运行我的程序时，它工作得很好，但有一些输出表明存在一些错误。
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Users\Exper\Documents\Visual Studio 2015\Projects\Lab3AssignmentOOP\Debug\Lab3AssignmentOOP.exe'. Symbols loaded.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp140d.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\vcruntime140d.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ucrtbased.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-timezone-l1-1-0.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-file-l2-1-0.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-localization-l1-2-0.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-synch-l1-2-0.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-processthreads-l1-1-1.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\winsxs\x86_microsoft-windows-u..rsalcrt-apifwd-win7_31bf3856ad364e35_6.1.7601.18878_none_4d8c75966cbcdb13\api-ms-win-core-file-l1-2-0.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Cannot find or open the PDB file.
'Lab3AssignmentOOP.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Cannot find or open the PDB file.
我检查了程序的属性 链接器＆gt;调试 生成程序数据库文件$（OutDir）$（TargetName）.pdb
我没有看到任何问题，但为什么在运行程序时出现这些错误？这些重要的错误是什么？