Looks like a config issue,  upload the config of the plugin. I will check it

{
"Apply patch to user quarry to fix long run time": true,
"Apply patch for mining rates for more precise pM config params": false,
"Patch for ladder flyhack": true,
"Patch for light signal when quarry is running": true,
"Maximum stack size for diesel engine (-1 to disable function)": -1,
"Number of slots for diesel storage (-1 to disable function)": -1,
"Number of slots for output storage (-1 to disable function)": -1,
"Enable static quarry resource modifier": false,
"refill command name": "backpumpjack.refill",
"Info command name": "backpumpjack.info",
"Settings": {
"Use Teams": true,
"Use Friends": true,
"Use Clans": false,
"Use clan table": false,
"Block damage another player's survey crater": true,
"Block deploy a quarry on another player's survey crater": true
},
"Chat Settings": {
"Chat Prefix": "<color=#00FFFF>[BackPumpJack]</color>: ",
"Chat SteamID Icon": 0
},
"Permission List": [
{
"Permission": "backpumpjack.use",
"Priority": 0,
"Oil Crater Chance": 40.0,
"Oil Crater Settings": {
"Minimum Mineral Amount": 0,
"Maximum Mineral Amount": 0,
"Allow Duplication Of Mineral Item": false,
"Mineral Items": []
},
"Normal Crater Settings": {
"Modify Chance (If not modified, use default mineral)": 0.0,
"Minimum Mineral Amount": 0,
"Maximum Mineral Amount": 0,
"Allow Duplication Of Mineral Item": true,
"Mineral Items": []
}
},
{
"Permission": "backpumpjack.vip",
"Priority": 1,
"Oil Crater Chance": 40.0,
"Oil Crater Settings": {
"Minimum Mineral Amount": 0,
"Maximum Mineral Amount": 0,
"Allow Duplication Of Mineral Item": false,
"Mineral Items": []
},
"Normal Crater Settings": {
"Modify Chance (If not modified, use default mineral)": 50.0,
"Minimum Mineral Amount": 1,
"Maximum Mineral Amount": 3,
"Allow Duplication Of Mineral Item": false,
"Mineral Items": [
{
"Mineral Item Short Name": "stones",
"Chance": 60.0,
"Minimum pM": 120.0,
"Maximum pM": 180.0
},
{
"Mineral Item Short Name": "metal.ore",
"Chance": 50.0,
"Minimum pM": 15.0,
"Maximum pM": 25.0
},
{
"Mineral Item Short Name": "sulfur.ore",
"Chance": 50.0,
"Minimum pM": 15.0,
"Maximum pM": 15.0
},
{
"Mineral Item Short Name": "hq.metal.ore",
"Chance": 50.0,
"Minimum pM": 1.5,
"Maximum pM": 2.0
}
]
}
}
],
"Static quarry settings": {
"Stone": {
"Mineral Items": [
{
"Mineral Item Short Name": "stones",
"Resource per minutes (pM)": 2500.0
},
{
"Mineral Item Short Name": "metal.ore",
"Resource per minutes (pM)": 500.0
}
]
},
"HQM": {
"Mineral Items": [
{
"Mineral Item Short Name": "hq.metal.ore",
"Resource per minutes (pM)": 25.0
}
]
},
"Sulfur": {
"Mineral Items": [
{
"Mineral Item Short Name": "sulfur.ore",
"Resource per minutes (pM)": 500.0
}
]
},
"Oil": {
"Mineral Items": [
{
"Mineral Item Short Name": "crude.oil",
"Resource per minutes (pM)": 30.0
},
{
"Mineral Item Short Name": "lowgradefuel",
"Resource per minutes (pM)": 85.0
}
]
}
},
"Version": {
"Major": 1,
"Minor": 4,
"Patch": 23
}
}

You have some empty section. Its okay to have Modify Chance to 0.0
but sometime there is a bug in the game that delete the resource of quarry or pumpjack
When the plugin detect that condition it try to allocate new resource to the quarry
You get the error message because some config are empty

Minimum Mineral Amount and Maximum Mineral Amount should not be 0
and you need "Mineral Items" define with at least the maximum resource amount

"Normal Crater Settings": {
"Modify Chance (If not modified, use default mineral)": 0.0,
"Minimum Mineral Amount": 0,
"Maximum Mineral Amount": 0,
"Allow Duplication Of Mineral Item": true,
"Mineral Items": []
}

"Oil Crater Settings": {
"Minimum Mineral Amount": 0,
"Maximum Mineral Amount": 0,
"Allow Duplication Of Mineral Item": false,
"Mineral Items": []
},