dump command problem

greetings dear users!
I was doing this tensile graphen MD simulation and i faced an error while trying to use the dump command in order to have the values of tension on a file. the error says: “invalid dump style”
here is the code:

compute 1 mid stress/atom
compute 2 mid reduce sum c_1[2]
variable tension equal c_1[2]
dump 2 mid costum 100 dump.xyz c_1[2]

please help me and tell me how to fix it.

greetings dear users!
I was doing this tensile graphen MD simulation and i faced an error while trying to use the dump command in order to have the values of tension on a file. the error says: “invalid dump style”
here is the code:
compute 1 mid stress/atom
compute 2 mid reduce sum c_1[2]
variable tension equal c_1[2]
dump 2 mid costum 100 dump.xyz c_1[2]
please help me and tell me how to fix it.

Remove the typo.