FCPX 10.5.3 crashes when exporting project

Hi All

unfortunately, my FCPX was upgraded to the latest version 10.5.3 . and since then, I can't export any project. The application crashes and quit. seeking any support to resolve the issue.

I have tried everything:

1- Restart machine

2- reset NVram

3- change user

4- create different projects

5- remove FCPX and re-install it

I am working on

Mac (Retina 4K, 21.5-inch, Late 2015)

3.3 GHz Quad-Core Intel Core i7

16 GB 1867 MHz DDR3

500 SSD with 225GB free

below is the crash report:

Process:               Final Cut Pro [5656]
Path:                  /Applications/Final Cut Pro.app/Contents/MacOS/Final Cut Pro
Identifier:            com.apple.FinalCut
Version:               10.5.3 (400092)
Build Info:            ProEditor-38300092012000000~2 (17E95)
App Item ID:           424389933
App External ID:       842271101
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Final Cut Pro [5656]
User ID:               501

Date/Time:             2021-06-23 10:57:12.309 +0300
OS Version:            macOS 11.4 (20F71)
Report Version:        12
Anonymous UUID:        31F3A968-A814-FD2A-04BD-D2B90A0B7863

Sleep/Wake UUID:       34234B90-27CD-442D-9F7E-04772D5B1A24

Time Awake Since Boot: 21000 seconds
Time Since Wake:       4800 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000308c743c61e0
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [5656]

VM Regions Near 0x308c743c61e0:
    CoreUI image data           13a6f4000-13a725000    [  196K] r--/r-- SM=PRV  
--> 
    MALLOC_NANO              600000000000-600008000000 [128.0M] rw-/rwx SM=SHM  

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib               	0x00007fff202aa4af objc_release + 31
1   com.apple.Foundation          	0x00007fff212c711d -[NSXMLNode dealloc] + 49
2   com.apple.Foundation          	0x00007fff212cb282 -[NSXMLElement setChildren:] + 227
3   com.apple.Foundation          	0x00007fff212c711d -[NSXMLNode dealloc] + 49
4   com.apple.Foundation          	0x00007fff212caa82 -[NSXMLElement dealloc] + 286
5   libobjc.A.dylib               	0x00007fff202c820f AutoreleasePoolPage::releaseUntil(objc_object**) + 167
6   libobjc.A.dylib               	0x00007fff202aae30 objc_autoreleasePoolPop + 161
7   com.apple.CoreFoundation      	0x00007fff204c4a86 _CFAutoreleasePoolPop + 22
8   com.apple.Foundation          	0x00007fff212632bb -[NSAutoreleasePool drain] + 131
9   com.apple.AppKit              	0x00007fff22cf326b -[NSApplication run] + 636
10  com.apple.LunaKit             	0x0000000109b20d74 LKApplicationMain + 340
11  libdyld.dylib                 	0x00007fff20425f5d start + 1