hello,
i have dspace 6.3 installed with apache-ant-1.10.10,  
apache-tomcat-9.0.45, apache-maven-3.6.3, java8.

it functions normaly until recently, when users click on bitstreams (pdf or 
docx files) to download , it shows blank pagewithout any error message and 
without downloading the file of course, 

when i look to the logs, when the bitstream is clicked, it shows me this:

2022-03-14 15:50:04,194 INFO  org.dspace.app.webui.servlet.HandleServlet @ 
i...@gmail.com:session_id=B6729E2E124B8305EC7E75C5E8EC96A3:ip_addr=172.20.0.193:view_item:handle=123456789/2388
2022-03-14 15:50:04,204 INFO  org.dspace.usage.LoggerUsageEventListener @ 
i...@gmail.com:session_id=B6729E2E124B8305EC7E75C5E8EC96A3:ip_addr=172.20.0.193:view_item:handle=123456789/2388
2022-03-14 15:50:09,026 INFO  org.dspace.app.webui.servlet.BitstreamServlet 
@ 
i...@gmail.com:session_id=B6729E2E124B8305EC7E75C5E8EC96A3:ip_addr=172.20.0.193:view_bitstream:bitstream_id=2281d047-cf69-4507-acf0-9b9ac20235b1
2022-03-14 15:50:09,026 INFO  org.dspace.usage.LoggerUsageEventListener @ 
i...@gmail.com:session_id=B6729E2E124B8305EC7E75C5E8EC96A3:ip_addr=172.20.0.193:view_bitstream:bitstream_id=2281d047-cf69-4507-acf0-9b9ac20235b1
2022-03-14 15:50:09,027 ERROR org.dspace.storage.bitstore.DSBitStoreService 
@ get(157061081078946674319142175541180994295)
java.io.FileNotFoundException: 
/usr/local/dspace/assetstore/15/70/61/157061081078946674319142175541180994295 
(No such file or directory)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at 
org.dspace.storage.bitstore.DSBitStoreService.get(DSBitStoreService.java:91)
        at 
org.dspace.storage.bitstore.BitstreamStorageServiceImpl.retrieve(BitstreamStorageServiceImpl.java:216)
        at 
org.dspace.content.BitstreamServiceImpl.retrieve(BitstreamServiceImpl.java:309)
        at 
org.dspace.app.webui.servlet.BitstreamServlet.doDSGet(BitstreamServlet.java:217)
        at 
org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:126)
        at 
org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:73)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at 
org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707)
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
2022-03-14 15:50:09,028 WARN  org.dspace.app.webui.servlet.DSpaceServlet @ 
i...@gmail.com:session_id=B6729E2E124B8305EC7E75C5E8EC96A3:ip_addr=172.20.0.193:io_error:java.io.IOException\colon;
 
java.io.FileNotFoundException\colon; 
/usr/local/dspace/assetstore/15/70/61/157061081078946674319142175541180994295 
(No such file or directory)

any help please,

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