Here is the fixed update hope it helps

GatherRewards Fix

Failed compiling 'GatherRewards.cs':
1. There is no argument given that corresponds to the required parameter 'destination' of 'MemoryExtensions.ToLower(ReadOnlySpan<char>, Span<char>, CultureInfo)' [CS7036]
(GatherRewards 33 line 573)
2. Cannot implicitly convert type 'string' to 'int' [CS0029]
(GatherRewards 22 line 575)

Rusty69

Failed compiling 'GatherRewards.cs':
1. There is no argument given that corresponds to the required parameter 'destination' of 'MemoryExtensions.ToLower(ReadOnlySpan<char>, Span<char>, CultureInfo)' [CS7036]
(GatherRewards 33 line 573)
2. Cannot implicitly convert type 'string' to 'int' [CS0029]
(GatherRewards 22 line 575)

working here make sure your server is updated [CSharp] Started Oxide.Compiler v successfully
GatherRewards was compiled successfully in 1494ms
Unloaded plugin Gather Rewards v1.7.1 by Shady14u
Loaded plugin Gather Rewards v1.7.1 by Shady14u

Rusty69

Failed compiling 'GatherRewards.cs':
1. There is no argument given that corresponds to the required parameter 'destination' of 'MemoryExtensions.ToLower(ReadOnlySpan<char>, Span<char>, CultureInfo)' [CS7036]
(GatherRewards 33 line 573)
2. Cannot implicitly convert type 'string' to 'int' [CS0029]
(GatherRewards 22 line 575)

will check again now my side  

UPDATE: still working for me

RYGNation

working here make sure your server is updated [CSharp] Started Oxide.Compiler v successfully
GatherRewards was compiled successfully in 1494ms
Unloaded plugin Gather Rewards v1.7.1 by Shady14u
Loaded plugin Gather Rewards v1.7.1 by Shady14u

Sorry I hadn't realised you had posted a fix, I thought you were also reporting it was broken to the plugin owner.

Rusty69

Sorry I hadn't realised you had posted a fix, I thought you were also reporting it was broken to the plugin owner.

ahh no problem no i posted a fix that worked for me im not the best at the fixes but seems to work and i hope i did it right. ive had no issues myself