Wad making problem

[Hairwig]

I just finished making a WAD, when i added it into the game this error message came up

R_IntstallSptiteLump: Bad frame characters in lump NBMPA4A63/4OUR!

can someone please tell me what the problem may be?

 

[supersonic45]

You have a lump in the wad that SRB2 can't read.

 

[I'll Begin]

That happens to be too, it confuses me and I don't know how to fix it.