I have the same problem on Linux Mint 18.3 (Ubuntu derivitive). I could
access files and folders except for the folder containing a whole lot of
images. Error message was:

The folder contents could not be displayed. 
Sorry, could not display all the contents of "Wallpaper" : libmtp error: could 
not get object handles.

I tried restarting the computer, and the phone independently - neither
resolved the issue. After researching this issue, several people
suggested that the number of files (in the folder) may be an issue.

This work-around resolved the issue for me: On my phone, I created a new
folder at the same level as the problem folder, and moved 1 file from
the problem folder to the new folder. I could then access the problem
folder from my Linux machine. I copied some more files into the folder,
and then moved the relocated file back into the previously problematic
folder and could still access the folder. I then removed the newly
created (and now empty) folder.

Ok. Some more information that may help resolve the problem:
There were 1788 files in the folder when I encountered the issue.
There were 1787 files in it after I moved 1 file and could access the folder.
There were 1816 files in the folder when I'd finished copying files (and it was 
still accessible).
The folder containing the files is a sub folder of another user created folder 
on the phone.

The libmtp components on my system are:
$ dpkg -l | grep libmtp
ii  libmtp-common                                               1.1.10-2ubuntu1 
                                         all          Media Transfer Protocol 
(MTP) common files
ii  libmtp-dbg:amd64                                            1.1.10-2ubuntu1 
                                         amd64        Media Transfer Protocol 
(MTP) debugging symbols
ii  libmtp-dev:amd64                                            1.1.10-2ubuntu1 
                                         amd64        Media Transfer Protocol 
(MTP) development files
ii  libmtp-doc                                                  1.1.10-2ubuntu1 
                                         all          Media Transfer Protocol 
(MTP) library documentation
ii  libmtp-runtime                                              1.1.10-2ubuntu1 
                                         amd64        Media Transfer Protocol 
(MTP) runtime tools
ii  libmtp9:amd64                                               1.1.10-2ubuntu1 
                                         amd64        Media Transfer Protocol 
(MTP) library
ii  libmtpserver-dev                                            
0.0.4+15.04.20150219-0ubuntu3~gcc5.1                     amd64        Library 
for implementing MTP protocol servers - development files
ii  libmtpserver1                                               
0.0.4+15.04.20150219-0ubuntu3~gcc5.1                     amd64        Library 
for implementing MTP protocol servers - shared library

Other information that may help (though I suspect that this problem is not 
specific to this):
$ inxi -MSf
System:    Host: pj1 Kernel: 4.15.0-106-generic x86_64 (64 bit) Desktop: 
Cinnamon 3.6.7
           Distro: Linux Mint 18.3 Sylvia
Machine:   System: Gigabyte product: B250M-D3H v: Default string
           Mobo: Gigabyte model: B250M-D3H-CF v: x.x Bios: American Megatrends 
v: F2 date: 11/25/2016
CPU:       Quad core Intel Core i5-7400 (-MCP-) cache: 6144 KB 
           clock speeds: max: 3500 MHz 1: 974 MHz 2: 2984 MHz 3: 2485 MHz 4: 
2992 MHz
           CPU Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat 
arch_perfmon art avx avx2 bmi1 bmi2 bts
           clflush clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de 
ds_cpl dtes64 dtherm dts ept erms
           est f16c flexpriority flush_l1d fma fpu fsgsbase fxsr ht hwp 
hwp_act_window hwp_epp hwp_notify ibpb
           ibrs ida intel_pt invpcid invpcid_single lahf_lm lm mca mce md_clear 
mmx monitor movbe mpx msr mtrr
           nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge 
pln pni popcnt pse pse36 pti pts
           rdrand rdseed rdtscp rep_good sdbg sep smap smep ss ssbd sse sse2 
sse4_1 sse4_2 ssse3 stibp syscall tm
           tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer vme vmx vnmi vpid 
x2apic xgetbv1 xsave xsavec
           xsaveopt xsaves xtopology xtpr

Seems that this is an ongoing issue, so I hope this information helps to
resolve the issue in the end.

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https://bugs.launchpad.net/bugs/1810176

Title:
  libmtp error could not get object handles

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