Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 7fb9b2adafd056d269dd863461e2af31356ababa868ac30223d33f91319281a3:8:4
   |
 8 |     adminCap.createList(
 9 |       listId: listId,
10 |       name: name,
11 |       description: description, 
12 |       categoryId: categoryId, 
13 |       creator: creator,
14 |       creatorDapperAddress: creatorDapperAddress, 
15 |       fileName: fileName, 
16 |       previewImage: previewImage,
17 |       format: format, 
18 |       fileIPFS: fileIPFS, 
19 |       price: price, 
20 |       maxSupply: maxSupply
21 |       )
   |     ^^^

error: unexpectedly found nil while forcing an Optional value
   --> d756450f386fb4ac.MetaverseMarket:422:48
    |
422 |             MetaverseMarket.categoriesNFTsToSell[categoryId]!.append(listId)
    |                                                 ^^^^^^^^^^^^^