how to fix field(s) are not placed error

[yangyichu]

So I'm trying to run the examples yet many of the examples throw the error as shown below:(diffmpm as an example)
File "diffmpm.py", line 386, in
main()
File "diffmpm.py", line 348, in main
weights[i, j] = np.random.randn() * 0.01
...
RuntimeError: These field(s) are not placed:
File "diffmpm.py", line 32, in
actuator_id = ti.field(ti.i32)
File "diffmpm.py", line 33, in
particle_type = ti.field(ti.i32)
...............many similar errors...................
File "diffmpm.py", line 44, in
x_avg = vec()

So I tried to fix these errors by assigning a shape manually (ti.Vector.field(...shape=(xx,xx))), yet some shapes are not very clear to me and takes a lot of work, is there any decent fix of these?

I tried on windows and ubuntu18.04, both have similar issue, my taichi version is 0.7.31.

[erizmr]

Hi, @yangyichu , the errors should be sorted after the latest updates, please check the updated "diffmpm.py" :)

[ZiXuanVickyLu]

I am using taichi 0.8.9. yet I find those errors in my code, either. I can not fix it...It is very strange as (I think) I'm following the example from the offical docs, but it just reports this error, anyway...

[erizmr]

Hi @birepeople , would you mind posting your code so that we can help debug?

BTW, it is also recommended to post any Taichi related questions on this forum:
https://forum.taichi.graphics/