Q:
My colonist have the necessary materials in stockpile zones or shelves and enough medical skills to surgery. but show "Cannot cure: need material".

A :
If you schedule an surgery to cure a colonist and prepare the necessary medicine, but may not be able to perform the operation with the message "Cannot cure **** :Need material".

They are due to the patient not permitting the medication needed for treatment. Please allow the use of required medications on the Health tab.

The most common case is when glitterworld medicine is needed but the patient is only allowed medicines.

[Edit : 18 Aug, 2021]

1. Make sure DE Surgeries for RBSE only is enabled in the mod list.
   
   
2. Check if the patient has a finger injury (lost).
   https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2577845434
   
   
3. Make sure that the colonists who have been assigned a doctor's job have the medical skill level required for surgery.
   
   Ex; Repair finger surgery is a Normal difficulty, so make sure there are
   any colonists who have the required medical skill level 8 or above
   and are assigned a Doctor job.
   https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2577844977
   
   
4. Make sure that more than medicines are allowed to treat the patient.
   https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2577846286
   
   
5. Make sure the medicine is within reach of the colonists.
   https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2577847100
   
   
6. Make sure there is an open space on which the patient can be surgery on.
   https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2577848356