Failed to launch run 'impl_1' due to failures in the following run(s)

[lin742]

I am also doing a rocketchip transplant experiment recently, and I would like to ask you this question.
WARNING: [Synth 8-4767] Trying to implement RAM 'ram_last_reg' in registers. Block RAM or DRAM implementation is not possible; see log for reasons.
Reason is one or more of the following :
1: Write port has constant address.
2: No valid read/write found for RAM.
2: Only 1 word in RAM
RAM "ram_last_reg" dissolved into registers
/home/linlin/vvcs/vivado/Vivado/2018.3/bin/loader: line 213: 54511 Killed "$RDI_PROG" "$@"
[Fri Oct 15 15:53:00 2021] synth_1 finished
wait_on_run: Time (s): cpu = 00:00:48 ; elapsed = 00:01:08 . Memory (MB): peak = 1438.477 ; gain = 0.000 ; free physical = 1185 ; free virtual = 1278

launch_runs impl_1 -to_step write_bitstream

ERROR: [Common 17-70] Application Exception: Failed to launch run 'impl_1' due to failures in the following run(s):
synth_1
These failed run(s) need to be reset prior to launching 'impl_1' again.

Vivado%